Numbers / 677

The Number 677

677 is prime: only 1 and 677 divide it evenly; the next prime after 677 is 683. 677's proper divisors total just 1, 676 short of 677, the deficient case most of 677's neighbors share too. 677 has a digit sum of 20; for 677, the digital root works out to 2. 677 shares no factor with 2-12; 677's own divisors start beyond that range. 677 is 1010100101 in binary and 2A5 in hex; as a Roman numeral it's DCLXXVII.