688553668 has 48 divisors (see below), whose sum is σ = 1403652096. Its totient is φ = 292390560.

The previous prime is 688553639. The next prime is 688553693. The reversal of 688553668 is 866355886.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35605 + ... + 51427.

It is an arithmetic number, because the mean of its divisors is an integer number (29242752).

Almost surely, 2^688553668 is an apocalyptic number.

It is an amenable number.

688553668 is an abundant number, since it is smaller than the sum of its proper divisors (715098428).

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

688553668 is a wasteful number, since it uses less digits than its factorization.

688553668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15904 (or 15902 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 55.

The square root of 688553668 is about 26240.3061719943. The cubic root of 688553668 is about 883.0377403584.

The spelling of 688553668 in words is "six hundred eighty-eight million, five hundred fifty-three thousand, six hundred sixty-eight".