73

73 (seventy-three) is a positive integer following 72 and preceding 74. Its ordinal form is written "seventy-third" or 73rd.
== Properties ==
*73 is an and a permutable prime.
*73 is the 4th smallest ,MathWorld, Star Number a number expressed with 6n(n − 1) + 1 for a positive integer n.
*It is one of only four known , which are neither nor s.
== In googology ==
In Greek-based number-naming systems, 73 is associated with prefix "triaheptaconta-", and with prefix "treseptuaginti-" in Latin systems.
== Sources ==
Category:Class 1
Category:Numbers with 1 to 2 digits
Category:Prime numbers