Numbers / 872

The Number 872

872 is composite: factorization 2^3 × 109. That gives 872 exactly 8 divisors: 1, 2, 4, 8, 109, 218, 436, 872. 872's proper divisors total just 778, 94 short of 872, the deficient case most of 872's neighbors share too. 872 has a digit sum of 17; for 872, the digital root works out to 8. 872: 2, 4, 8 all divide 872 evenly, out of 2-12. 872 is 1101101000 in binary and 368 in hex; as a Roman numeral it's DCCCLXXII.