778672756 has 12 divisors (see below), whose sum is σ = 1406634880. Its totient is φ = 376777080.

The previous prime is 778672711. The next prime is 778672757. The reversal of 778672756 is 657276877.

It is a junction number, because it is equal to n+sod(n) for n = 778672697 and 778672706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778672757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3139686 + ... + 3139933.

Almost surely, 2^778672756 is an apocalyptic number.

It is an amenable number.

778672756 is a deficient number, since it is larger than the sum of its proper divisors (627962124).

778672756 is a wasteful number, since it uses less digits than its factorization.

778672756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6279654 (or 6279652 counting only the distinct ones).

The product of its digits is 6914880, while the sum is 55.

The square root of 778672756 is about 27904.7084915790. The cubic root of 778672756 is about 919.9939964952.

The spelling of 778672756 in words is "seven hundred seventy-eight million, six hundred seventy-two thousand, seven hundred fifty-six".