Numbers / 8

The Number 8

8 is composite: factorization 2^3. That gives 8 exactly 4 divisors: 1, 2, 4, 8. 8's proper divisors total just 7, 1 short of 8, the deficient case most of 8's neighbors share too. 8 also carries: a perfect cube, since 2³ = 8; and a Fibonacci number, since 5 + 3 = 8. 8 has a digit sum of 8; for 8, the digital root works out to 8. 8: 2, 4 all divide 8 evenly, out of 2-12. 8 is 1000 in binary and 8 in hex; as a Roman numeral it's VIII.