90

90 (ninety) is a positive integer following 89 and preceding 91. Its ordinal form is written "ninetieth" or 90th.
== Properties ==
90 is an OEIS, Sequence A002808 (accessed 2021-02-07).
It is also the number of s without energetically allowed baryon number-preserving decay modes.
90 is the third .
== In googology ==
In Greek-based number-naming systems, 90 is associated with prefix "enneaconta-", and with prefix "nonaginti-" in Latin systems.
== As a banknote denomination ==
The third had banknotes with this number in the denomination.
== In Germany ==
It is an abbreviation for , in which the won its third title.
For this reason, it has been used in a song by the .
In the same year, the took place. For this reason, it has been used in the .
==Sources==
Category:Numbers
Category:Banknote denominations
Category:Class 1
Category:Non-powers
Category:Numbers 0-99
Category:Numbers in politics
Category:Numbers in pop culture
Category:Numbers in science
Category:Numbers in sports
Category:Numbers with 1 to 2 digits