670

670 = 2 x 5 x 67.

670 is an octahedral number (A005900).

670 is a sum of composite numbers between successive primes (A054265).

670 is the number of ways of making change for 57 cents using coins of 1, 2, 5, 10, 20, and 50 cents (A001313).

670 is the sum of 15 but no fewer nonzero fourth powers (A046046).

Source: What's Special About This Number?