75 (number)

75 is the natural number following 74 and preceding 76.

List of numbersIntegers

<< 70 71 72 73 74 75 76 77 78 79 >>

Cardinal seventy-five
Ordinal75th (seventy-fifth)
Factorization<math>3 \cdot 5^2<math>
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 (http://www.ngcic.org/) NGC 75, a spiral galaxy in the constellation Pisces
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) 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 (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) 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:

eo:Sepdek kvin ko:75 ia:75 it:Settantacinque ja:75 sl:75 (število) sv:75 (tal) zh:75

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