Numbers / 676

The Number 676

676 is composite: factorization 2^2 × 13^2. That gives 676 exactly 9 divisors: 1, 2, 4, 13, 26, 52, 169, 338, 676. 676's proper divisors total just 605, 71 short of 676, the deficient case most of 676's neighbors share too. 676 also carries: a perfect square, since 26² = 676; and a palindrome, since 676 reads identically forwards and backwards. 676 has a digit sum of 19; for 676, the digital root works out to 1. 676: 2, 4 all divide 676 evenly, out of 2-12. 676 is 1010100100 in binary and 2A4 in hex; as a Roman numeral it's DCLXXVI.