Numbers / 36

The Number 36

36 is composite: factorization 2^2 × 3^2. That gives 36 exactly 9 divisors: 1, 2, 3, 4, 6, 9, 12, 18, 36. 36's proper divisors total 55, 19 more than 36 itself, so 36 is abundant. 36 also carries: a perfect square, since 6² = 36; and the 8th triangular number, the sum of 1 through 8. 36 has a digit sum of 9; for 36, the digital root works out to 9. 36: 2, 3, 4, 6, 9, 12 all divide 36 evenly, out of 2-12. 36 is 100100 in binary and 24 in hex; as a Roman numeral it's XXXVI.