Numbers / 623

The Number 623

623 is composite: factorization 7 × 89. That gives 623 exactly 4 divisors: 1, 7, 89, 623. 623's proper divisors total just 97, 526 short of 623, the deficient case most of 623's neighbors share too. 623 has a digit sum of 11; for 623, the digital root works out to 2. 623: 7 all divide 623 evenly, out of 2-12. 623 is 1001101111 in binary and 26F in hex; as a Roman numeral it's DCXXIII.