Numbers / 655

The Number 655

655 is composite: factorization 5 × 131. That gives 655 exactly 4 divisors: 1, 5, 131, 655. 655's proper divisors total just 137, 518 short of 655, the deficient case most of 655's neighbors share too. 655 has a digit sum of 16; for 655, the digital root works out to 7. 655: 5 all divide 655 evenly, out of 2-12. 655 is 1010001111 in binary and 28F in hex; as a Roman numeral it's DCLV.