688656056 has 16 divisors (see below), whose sum is σ = 1408614840. Its totient is φ = 313025440.

The previous prime is 688656053. The next prime is 688656061. The reversal of 688656056 is 650656886.

It is a junction number, because it is equal to n+sod(n) for n = 688655995 and 688656013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688656053) 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, 3912731 + ... + 3912906.

Almost surely, 2^688656056 is an apocalyptic number.

It is an amenable number.

688656056 is an abundant number, since it is smaller than the sum of its proper divisors (719958784).

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

688656056 is a wasteful number, since it uses less digits than its factorization.

688656056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7825654 (or 7825650 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 50.

The square root of 688656056 is about 26242.2570675619. The cubic root of 688656056 is about 883.0815074561.

The spelling of 688656056 in words is "six hundred eighty-eight million, six hundred fifty-six thousand, fifty-six".