64 (number)

64 is the natural number following 63 and preceding 65.

List of numbersIntegers

<< 60 61 62 63 64 65 66 67 68 69 >>

Cardinal sixty-four
Ordinal64th (sixty-fourth)
Numeral system 
Factorization<math>2^6\,\!<math>
Divisors 2, 4, 8, 16, 32
Roman numeralLXIV
Binary1000000
Hexadecimal40

In mathematics

Sixty-four is the square of 8 and the cube of 4. It is the lowest positive power of two that is adjacent to neither a Mersenne prime nor a Fermat prime. It is also a dodecagonal number and a centered triangular number. 64 is a self number.

In science

In astronomy,

Messier object M64, a magnitude 9.0 galaxy in the constellation Coma Berenices, also known as the Black Eye Galaxy.
The New General Catalogue object (http://www.ngcic.org/) NGC 64, a barred spiral galaxy in the constellation Cetus
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) of the solar eclipse series which began on -832 April 11 and ended on 430 May 8. The duration of Saros series 64 was 1262.1 years, and it contained 71 solar eclipses.
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) of the lunar eclipse series which began on -801 August 9 and ended on 714 February 4. The duration of Saros series 64 was 1514.5 years, and it contained 85 lunar eclipses.

In other fields

Sixty-four is also:

ko:64 ia:64 it:Sessantaquattro ja:64

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