45 (number)
From Wikipedia, the free encyclopedia
In mathematics: Forty-five is a triangular number, a hexagonal and 16-gonal number, a Kaprekar number, and a Harshad number.
In science: The atomic number of ruthenium
In music: A type of gramophone record classified by its revolution speed of 45 revolutions per minute (rpm)
- Included in the title of "45 and Fat", a 1996 song by Babybird
- The title of a 2002 song by Elvis Costello, "45", both referring to the 45 rpm singles and to the artist’s age when he wrote the song, which was released when he was 47
- The title of a 2006 song by noodles, "45"
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