678281656 has 32 divisors (see below), whose sum is σ = 1401467760. Its totient is φ = 305770752.

The previous prime is 678281633. The next prime is 678281687. The reversal of 678281656 is 656182876.

It is a super-2 number, since 2×678281656² = 920132009732204672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71365 + ... + 80308.

Almost surely, 2^678281656 is an apocalyptic number.

It is an amenable number.

678281656 is an abundant number, since it is smaller than the sum of its proper divisors (723186104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678281656 is a wasteful number, since it uses less digits than its factorization.

678281656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151735 (or 151731 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

The square root of 678281656 is about 26043.8410377579. The cubic root of 678281656 is about 878.6245972916.

The spelling of 678281656 in words is "six hundred seventy-eight million, two hundred eighty-one thousand, six hundred fifty-six".