52 (number)

From Wikipedia, the free encyclopedia
← 51 52 53 →
← 50 51 52 53 54 55 56 57 58 59 →
List of numbers — Integers
← 0 10 20 30 40 50 60 70 80 90 →
Cardinalfifty-two
Ordinal52nd
(fifty-second)
Factorization22 × 13
Divisors1, 2, 4, 13, 26, 52
Greek numeralΝΒ´
Roman numeralLII
Binary1101002
Ternary12213
Octal648
Duodecimal4412
Hexadecimal3416

52 (fifty-two) is the natural number following 51 and preceding 53.

In mathematics[]

Fifty-two is

  • the 5th Bell number,[1] the number of ways to partition a set of 5 objects.
  • a decagonal number.[2]
  • an untouchable number, since it is never the sum of proper divisors of any number,[3] and it is a noncototient since it is not equal to x − φ(x) for any x.[4]

In science[]

  • The atomic number of tellurium

Astronomy[]

  • Messier object M52, a magnitude 8.0 open cluster in the constellation Cassiopeia, also known as NGC 7654.
  • The New General Catalogue object NGC 52, a spiral galaxy in the constellation Pegasus.

In other fields[]

The piano has 52 white keys

Fifty-two is:

  • The approximate number of weeks in a year. 52 weeks is 364 days, while the tropical year is 365.24 days long. According to ISO 8601, most years have 52 weeks while some have 53.
  • A significant number in the Maya calendar
  • On the modern piano, the number of white keys (notes in the C major 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 Pickup
  • 52 Pick-Up 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 Comics entitled 52 has 52 issues, with a plot spanning one full year.
  • The New 52 is a 2011 revamp and relaunch by DC Comics of its entire line of ongoing monthly superhero books.
  • The number of letters in the English alphabet, if majuscules are distinguished from minuscules
  • The number of the French department Haute-Marne
  • 52nd Street (disambiguation)
  • 52 Hand Blocks, a variant of the martial art jailhouse rock.
  • 52 is the car number of retired NASCAR driver Jimmy Means
  • 52 American hostages were held in the Iran hostage crisis
  • The number of the laps of the British Grand Prix since 2010.

Historical years[]

52 BC, AD 52, 1052, 1952, 2052, etc.

See also[]

B52 (disambiguation)

References[]

  1. ^ "Sloane's A000110 : Bell or exponential numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  2. ^ "Sloane's A001107 : 10-gonal (or decagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  3. ^ "Sloane's A005114 : Untouchable numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  4. ^ "Sloane's A005278 : Noncototients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
Retrieved from ""