52 (number)

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← 51 52 53 →
Cardinal fifty-two
Ordinal 52nd
(fifty-second)
Factorization 22× 13
Divisors 1, 2, 4, 13, 26, 52
Roman numeral LII
Binary 1101002
Ternary 12213
Quaternary 3104
Quinary 2025
Senary 1246
Octal 648
Duodecimal 4412
Hexadecimal 3416
Vigesimal 2C20
Base 36 1G36

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

In mathematics[edit]

Fifty-two is the 6th Bell number[1] and a decagonal number.[2] It is an untouchable number, since it is never the sum of proper divisors of any number,[3] and it is a noncototient since it is never the answer to the equation x − φ(x).[4]

In science[edit]

Astronomy[edit]

In other fields[edit]

The piano has 52 white keys

Fifty-two is:

Historical years[edit]

52 B.C., 52 A.D., 1952, 2052, etc.

See also[edit]

B52 (disambiguation)

References[edit]

  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.