Numbers / 680

The Number 680

680 is composite: factorization 2^3 × 5 × 17. That gives 680 exactly 16 divisors: 1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680. 680's proper divisors total 940, 260 more than 680 itself, so 680 is abundant. 680 has a digit sum of 14; for 680, the digital root works out to 5. 680: 2, 4, 5, 8, 10 all divide 680 evenly, out of 2-12. 680 is 1010101000 in binary and 2A8 in hex; as a Roman numeral it's DCLXXX.