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52 (number)
Encyclopedia
52 is the natural number
following 51 and preceding 53
.
and a decagonal number
. It is an untouchable number
, since it is never the sum of proper divisors of any number, and it is a noncototient
since it is never the answer to the equation x - φ(x).
Fifty-two is:
Natural number
In mathematics, the natural numbers are the ordinary whole numbers used for counting and ordering . These purposes are related to the linguistic notions of cardinal and ordinal numbers, respectively...
following 51 and preceding 53
53 (number)
53 is the natural number following 52 and preceding 54.-In mathematics:Fifty-three is the 16th prime number. It is also an Eisenstein prime....
.
In mathematics
Fifty-two is the 6th Bell numberBell number
In combinatorics, the nth Bell number, named after Eric Temple Bell, is the number of partitions of a set with n members, or equivalently, the number of equivalence relations on it...
and a decagonal number
Decagonal number
A decagonal number is a figurate number that represents a decagon. The n-th decagonal number is given by the formulaThe first few decagonal numbers are:...
. It is an untouchable number
Untouchable number
An untouchable number is a positive integer that cannot be expressed as the sum of all the proper divisors of any positive integer ....
, since it is never the sum of proper divisors of any number, and it is a noncototient
Noncototient
In mathematics, a noncototient is a positive integer n that cannot be expressed as the difference between a positive integer m and the number of coprime integers below it. That is, m − φ = n, where φ stands for Euler's totient function, has no solution for m...
since it is never the answer to the equation x - φ(x).
Astronomy
- Messier objectMessier objectThe Messier objects are a set of astronomical objects first listed by French astronomer Charles Messier in 1771. The original motivation of the catalogue was that Messier was a comet hunter, and was frustrated by objects which resembled but were not comets...
M52, a magnitude 8.0 open clusterOpen clusterAn open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way Galaxy, and many more are thought to exist...
in the constellationConstellationIn modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
CassiopeiaCassiopeia (constellation)Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty. Cassiopea was one of the 48 constellations listed by the 2nd century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today...
, also known as - The New General CatalogueNew General CatalogueThe New General Catalogue of Nebulae and Clusters of Stars is a well-known catalogue of deep sky objects in astronomy. It contains 7,840 objects, known as the NGC objects...
object NGC 52, a spiral galaxySpiral galaxyA spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, forms part of the Hubble sequence. Spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as...
in the constellation PegasusPegasus (constellation)Pegasus is a constellation in the northern sky, named after the winged horse Pegasus in Greek mythology. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations.-Stars:... - The Saros number of the solar eclipseSolar eclipseAs seen from the Earth, a solar eclipse occurs when the Moon passes between the Sun and the Earth, and the Moon fully or partially blocks the Sun as viewed from a location on Earth. This can happen only during a new moon, when the Sun and the Moon are in conjunction as seen from Earth. At least...
series which began on -1378 August 14 and ended on 155 February. The duration of Saros series 52 was 1532.5 years, and it contained 86 solar eclipses. The Saros number of the lunar eclipseLunar eclipseA lunar eclipse occurs when the Moon passes behind the Earth so that the Earth blocks the Sun's rays from striking the Moon. This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a...
series which began on -1026 May 27 and ended on 204 June. The duration of Saros series 52 was 1280.1 years, and it contained 72 lunar eclipses.
In other fields
- U.S. Route 52U.S. Route 52U.S. Route 52 is a United States highway that runs across the northern, eastern and southeastern regions of the United States. Contrary to most other even-numbered U.S...
that runs from South CarolinaSouth CarolinaSouth Carolina is a state in the Deep South of the United States that borders Georgia to the south, North Carolina to the north, and the Atlantic Ocean to the east. Originally part of the Province of Carolina, the Province of South Carolina was one of the 13 colonies that declared independence...
to North DakotaNorth DakotaNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
- The approximate number of weeks in a year. 52 weeks is 364 days, while the tropical yearTropical yearA tropical year , for general purposes, is the length of time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice...
is 365.24 days long. According to ISO 8601ISO 8601ISO 8601 Data elements and interchange formats – Information interchange – Representation of dates and times is an international standard covering the exchange of date and time-related data. It was issued by the International Organization for Standardization and was first published in 1988...
, most years have 52 weeks while some have 53. - A significant number in the Maya calendarMaya calendarThe Maya calendar is a system of calendars and almanacs used in the Maya civilization of pre-Columbian Mesoamerica, and in many modern Maya communities in highland Guatemala. and in Chiapas....
- On the pianoPianoThe piano is a musical instrument played by means of a keyboard. It is one of the most popular instruments in the world. Widely used in classical and jazz music for solo performances, ensemble use, chamber music and accompaniment, the piano is also very popular as an aid to composing and rehearsal...
, the number of white keys (notes in the C majorC majorC major is a musical major scale based on C, with pitches C, D, E, F, G, A, and B. Its key signature has no flats/sharps.Its relative minor is A minor, and its parallel minor is C minor....
scale) - The number of cards in a standard deck of playing cards, not counting Jokers or advertisement cards
- The name of a practical joke card game 52 Pickup52 Pickup52 Pickup or 52-Card Pickup is a children's game, using a standard deck of 52 playing cards, that verges on a practical joke. The name has also been used for solitaire versions and for legitimate educational children's games that are based on the fundamental principle of picking up scattered cards...
- "52 Pick-Up52 Pick-Up52 Pick-Up is a 1986 crime thriller film directed by John Frankenheimer. The film stars Roy Scheider and Ann-Margret and is based on Elmore Leonard's novel of the same name.-Plot:...
" is a film starring Roy Scheider and Ann Margaret - The code for international direct dial phone calls to Mexico
- A weekly comic series from DC ComicsDC ComicsDC Comics, Inc. is one of the largest and most successful companies operating in the market for American comic books and related media. It is the publishing unit of DC Entertainment a company of Warner Bros. Entertainment, which itself is owned by Time Warner...
entitled 5252 (comic book)52 was a weekly American comic book limited series published by DC Comics that debuted on May 10, 2006, one week after the conclusion of the seven-issue Infinite Crisis. The series was written by Geoff Johns, Grant Morrison, Greg Rucka, and Mark Waid with layouts by Keith Giffen...
has 52 issues, with a plot spanning one full year. - The number of letters in the English alphabetLatin alphabetThe Latin alphabet, also called the Roman alphabet, is the most recognized alphabet used in the world today. It evolved from a western variety of the Greek alphabet called the Cumaean alphabet, which was adopted and modified by the Etruscans who ruled early Rome...
, if majuscules are distinguished from minuscules - The number of the French department Haute-MarneHaute-MarneHaute-Marne is a department in the northeast of France named after the Marne River.-History:Haute-Marne is one of the original 83 departments created during the French Revolution on March 4, 1790...
- 52nd Street (disambiguation)
Sports
- 52 Hand Blocks, a variant of the martial artMartial artsMartial arts are extensive systems of codified practices and traditions of combat, practiced for a variety of reasons, including self-defense, competition, physical health and fitness, as well as mental and spiritual development....
jailhouse rock. - For over twenty years, 52 was the best-known car number of retired NASCARNASCARThe National Association for Stock Car Auto Racing is a family-owned and -operated business venture that sanctions and governs multiple auto racing sports events. It was founded by Bill France Sr. in 1947–48. As of 2009, the CEO for the company is Brian France, grandson of the late Bill France Sr...
driver Jimmy MeansJimmy MeansJames "Jimmy" Means is a former Winston Cup/Nextel Cup owner/driver. Currently, he is an adviser for Front Row Motorsports and owns his own team, Means Racing. He competed in NASCAR for eighteen years in mostly his own equipment, posting seventeen career top-tens...