30 is an even composite number and equal to five primorial.
30 is equal to 10!!!!!!!, the septuple factorial of 10.
In googology Edit
In Greek-based number-naming systems, 30 is associated with prefix "triaconta-", and with prefix "triginti-" in Latin systems.
As a banknote denomination Edit
The Tunisian dinar had banknotes with this number in the denomination.