Numbers / 64

The Number 64

64 is composite: factorization 2^6. That gives 64 exactly 7 divisors: 1, 2, 4, 8, 16, 32, 64. 64's proper divisors total just 63, 1 short of 64, the deficient case most of 64's neighbors share too. 64 also carries: a perfect square, since 8² = 64; and a perfect cube, since 4³ = 64. 64 has a digit sum of 10; for 64, the digital root works out to 1. 64: 2, 4, 8 all divide 64 evenly, out of 2-12. 64 is 1000000 in binary and 40 in hex; as a Roman numeral it's LXIV.