73 (seventy-three) is a positive integer following 72 and preceding 74. Its ordinal form is written "seventy-third" or 73rd.

Properties Edit

73 is an odd prime number and a permutable prime.

It is one of only four known Mersenne–Fermat primes, which are neither Fermat nor Mersenne primes.

In googology Edit

In Greek-based number-naming systems, 73 is associated with prefix "triaheptaconta-", and with prefix "treseptuaginti-" in Latin systems.