Numbers / 678

The Number 678

678 is composite: factorization 2 × 3 × 113. That gives 678 exactly 8 divisors: 1, 2, 3, 6, 113, 226, 339, 678. 678's proper divisors total 690, 12 more than 678 itself, so 678 is abundant. 678 has a digit sum of 21; for 678, the digital root works out to 3. 678: 2, 3, 6 all divide 678 evenly, out of 2-12. 678 is 1010100110 in binary and 2A6 in hex; as a Roman numeral it's DCLXXVIII.