678765656 has 8 divisors (see below), whose sum is σ = 1272685620. Its totient is φ = 339382824.

The previous prime is 678765623. The next prime is 678765679. The reversal of 678765656 is 656567876.

It is a happy number.

678765656 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×678765656² = 921445631530220672, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42422846 + ... + 42422861.

Almost surely, 2^678765656 is an apocalyptic number.

It is an amenable number.

678765656 is a deficient number, since it is larger than the sum of its proper divisors (593919964).

678765656 is a wasteful number, since it uses less digits than its factorization.

678765656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84845713 (or 84845709 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 56.

The square root of 678765656 is about 26053.1314048811. The cubic root of 678765656 is about 878.8335336983.

The spelling of 678765656 in words is "six hundred seventy-eight million, seven hundred sixty-five thousand, six hundred fifty-six".