688558864 has 20 divisors (see below), whose sum is σ = 1524666304. Its totient is φ = 295096608.

The previous prime is 688558847. The next prime is 688558867. The reversal of 688558864 is 468855886.

It is a super-2 number, since 2×688558864² = 948226618385940992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688558799 and 688558808.

It is not an unprimeable number, because it can be changed into a prime (688558867) 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, 3073812 + ... + 3074035.

Almost surely, 2^688558864 is an apocalyptic number.

It is an amenable number.

688558864 is an abundant number, since it is smaller than the sum of its proper divisors (836107440).

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

688558864 is a wasteful number, since it uses less digits than its factorization.

688558864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6147862 (or 6147856 counting only the distinct ones).

The product of its digits is 14745600, while the sum is 58.

The square root of 688558864 is about 26240.4051797986. The cubic root of 688558864 is about 883.0399615615.

The spelling of 688558864 in words is "six hundred eighty-eight million, five hundred fifty-eight thousand, eight hundred sixty-four".