688277568 has 56 divisors (see below), whose sum is σ = 1986625440. Its totient is φ = 208568320.

The previous prime is 688277567. The next prime is 688277581. The reversal of 688277568 is 865772886.

It is a happy number.

It is a super-2 number, since 2×688277568² = 947452021223989248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (688277567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160833 + ... + 165056.

Almost surely, 2^688277568 is an apocalyptic number.

It is an amenable number.

688277568 is an abundant number, since it is smaller than the sum of its proper divisors (1298347872).

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

688277568 is a wasteful number, since it uses less digits than its factorization.

688277568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325915 (or 325905 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 57.

The square root of 688277568 is about 26235.0446540500. The cubic root of 688277568 is about 882.9196961515.

The spelling of 688277568 in words is "six hundred eighty-eight million, two hundred seventy-seven thousand, five hundred sixty-eight".