45

45 (forty-five) is a positive integer following 44 and preceding 46. Its ordinal form is written "forty-fifth" or 45th.
== Properties ==
*45 is an .
*45 is the 9th .
*45 is a .
*45 RPM record was introduced on March 31, 1949 and soon replaced 78 RPM record.Alan Cross. It was 70 years ago this month that the 45 RPM record was introduced, accidentally helping to give birth to rock’n’roll, Journal of Musical Things. March 17, 2019.
== In googology ==
In Greek-based number-naming systems, 45 is associated with prefix "pentatetraconta-", and with prefix "quinquadraginti-" in Latin systems.
== As a banknote denomination ==
The third had banknotes with this number in the denomination.
== Sources ==
Category:Numbers
Category:Banknote denominations
Category:Class 1
Category:Non-powers
Category:Numbers 0-99
Category:Numbers with 1 to 2 digits
Category:Odd numbers