Numbers / 670

The Number 670

670 is composite: factorization 2 × 5 × 67. That gives 670 exactly 8 divisors: 1, 2, 5, 10, 67, 134, 335, 670. 670's proper divisors total just 554, 116 short of 670, the deficient case most of 670's neighbors share too. 670 has a digit sum of 13; for 670, the digital root works out to 4. 670: 2, 5, 10 all divide 670 evenly, out of 2-12. 670 is 1010011110 in binary and 29E in hex; as a Roman numeral it's DCLXX.