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45 (number)

Field	Value
number	45
divisor	1, 3, 5, 9, 15, 45

45 (forty-five) is the natural number following 44 and preceding 46.

In mathematics

45 as the difference of two nonzero squares (in orange)

45 is a composite number and a Størmer number.

Forty-five is conjectured from Ramsey number R(5, 5).

\phi(45)=\phi(\sigma(45))

Forty-five degrees is half of a right angle (90°).

In music

A type of gramophone record classified by its rotational speed of 45 revolutions per minute (rpm)

In other fields

Guns or ammunition of .45 caliber. In the United States, "45" is often a reference to one of two specific .45 caliber cartridges—the .45 Colt or the .45 ACP.
In years of marriage, the sapphire wedding anniversary.
Issue 45 of The North Briton was thought to be seditious but its publisher, John Wilkes, was celebrated as a champion of liberty. The number 45 was used as a symbol of support for him. Banquets were held with a theme of 45 while many items were produced showing the number or featuring it in some way. For example, a wig was produced with 45 curls.

References

{{Cite OEIS. A120414. Conjectured Ramsey number R(n,n).
{{Cite OEIS. A212954. Triangle read by rows: two color Ramsey numbers
{{cite OEIS. A006872
Arthur Hill Cash. (2007). "John Wilkes: The Scandalous Father of Civil Liberty". Yale University Press.

Info: Wikipedia Source

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