Numbers / 775

The Number 775

775 is composite: factorization 5^2 × 31. That gives 775 exactly 6 divisors: 1, 5, 25, 31, 155, 775. 775's proper divisors total just 217, 558 short of 775, the deficient case most of 775's neighbors share too. 775 has a digit sum of 19; for 775, the digital root works out to 1. 775: 5 all divide 775 evenly, out of 2-12. 775 is 1100000111 in binary and 307 in hex; as a Roman numeral it's DCCLXXV.