723

723 = 3 x 241.

723 = (1!)! + (2!)! + (3!)! (A059590).

723 = 3⁶ - 6.

723 is 333 in base 15.

723 is the smallest positive number that can be written as a sum of distinct Fibonacci numbers in 25 ways (A013583).

723 is the sum of fifth powers of primes (A122616): 723 = 3⁵ + 15(2⁵).

Source: What's Special About This Number?