56 (Number)

56 (fifty-six) is the natural number following 55 and preceding 57.
Cardinalfifty-six
Ordinal56th (fifty-sixth)
Factorization2^3\cdot 7
Divisors 2, 4, 7, 8, 14, 28
Roman numeralLVI
Binary111000
Hexadecimal38

In mathematics

56 is the sum of the first six triangular numbers (making it a tetrahedral number), as well as the sum of six consecutive primes (3 + 5 + 7 + 11 + 13 + 17). It is also a tetranacci number and a pronic number.

In science

In astronomy,
Messier object M56, a magnitude 9.5 globular cluster in the constellation Lyra
The New General Catalogue object NGC 56, an unverified object in the constellation Pisces. NGC 76 does not appear to be a real object.
The Saros number of the solar eclipse series which began on -1172 July 17 and ended on 144 September 15. The duration of Saros series 56 was 1316.2 years, and it contained 74 solar eclipses.
The Saros number of the lunar eclipse series which began on -852 May 7 and ended on 428 June 13. The duration of Saros series 56 was 1280.1 years, and it contained 72 lunar eclipses.

In other fields

56 is also: .

 

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