75 (Number)

75 is the natural number following 74 and preceding 76.
Cardinal seventy-five
Ordinal75th (seventy-fifth)
Factorization3 \cdot 5^2
Divisors 3, 5, 15, 25
Roman numeralLXXV
Binary1001011
Hexadecimal4B

In mathematics

As the sum of the first five pentagonal numbers, seventy-five is a pentagonal pyramidal number. It is also an enneagonal number. It is also a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 7, 5, 12, 17, 29, 46, 75... But there is no integer that added up to its own digits adds up to 75, hence 75 is a self number. There are 75 uniform polyhedra.

In science

In astronomy,
Messier object M75, a magnitude 9.5 globular cluster in the constellation Sagittarius
The New General Catalogue object NGC 75, a spiral galaxy in the constellation Pisces
The Saros number of the solar eclipse series which began on -604 July 7 and ended on 694 August 26. The duration of Saros series 75 was 1298.1 years, and it contained 73 solar eclipses.
The Saros number of the lunar eclipse series which began on -266 May 8 and ended on 1014 June 15. The duration of Saros series 75 was 1280.1 years, and it contained 72 lunar eclipses.

In other fields

Seventy-five is also:

 

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