Numbers / 778

The Number 778

778 is composite: factorization 2 × 389. That gives 778 exactly 4 divisors: 1, 2, 389, 778. 778's proper divisors total just 392, 386 short of 778, the deficient case most of 778's neighbors share too. 778 has a digit sum of 22; for 778, the digital root works out to 4. 778: 2 all divide 778 evenly, out of 2-12. 778 is 1100001010 in binary and 30A in hex; as a Roman numeral it's DCCLXXVIII.