688785056 has 24 divisors (see below), whose sum is σ = 1435814100. Its totient is φ = 324133888.

The previous prime is 688785037. The next prime is 688785077. The reversal of 688785056 is 650587886.

It can be written as a sum of positive squares in 2 ways, for example, as 680375056 + 8410000 = 26084^2 + 2900^2 .

It is a junction number, because it is equal to n+sod(n) for n = 688784989 and 688785007.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632531 + ... + 633618.

Almost surely, 2^688785056 is an apocalyptic number.

It is an amenable number.

688785056 is an abundant number, since it is smaller than the sum of its proper divisors (747029044).

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

688785056 is a wasteful number, since it uses less digits than its factorization.

688785056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266176 (or 1266168 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 53.

The square root of 688785056 is about 26244.7148203214. The cubic root of 688785056 is about 883.1366440279.

The spelling of 688785056 in words is "six hundred eighty-eight million, seven hundred eighty-five thousand, fifty-six".