Numbers / 890

The Number 890

890 is composite: factorization 2 × 5 × 89. That gives 890 exactly 8 divisors: 1, 2, 5, 10, 89, 178, 445, 890. 890's proper divisors total just 730, 160 short of 890, the deficient case most of 890's neighbors share too. 890 has a digit sum of 17; for 890, the digital root works out to 8. 890: 2, 5, 10 all divide 890 evenly, out of 2-12. 890 is 1101111010 in binary and 37A in hex; as a Roman numeral it's DCCCXC.