Numbers / 800

The Number 800

800 is composite: factorization 2^5 × 5^2. That gives 800 exactly 18 divisors: 1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 160, 200, 400, 800. 800's proper divisors total 1153, 353 more than 800 itself, so 800 is abundant. 800 has a digit sum of 8; for 800, the digital root works out to 8. 800: 2, 4, 5, 8, 10 all divide 800 evenly, out of 2-12. 800 is 1100100000 in binary and 320 in hex; as a Roman numeral it's DCCC.