688464880 has 20 divisors (see below), whose sum is σ = 1600681032. Its totient is φ = 275385920.

The previous prime is 688464871. The next prime is 688464947. The reversal of 688464880 is 88464886.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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, 4302826 + ... + 4302985.

Almost surely, 2^688464880 is an apocalyptic number.

It is an amenable number.

688464880 is an abundant number, since it is smaller than the sum of its proper divisors (912216152).

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

688464880 is a wasteful number, since it uses less digits than its factorization.

688464880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8605824 (or 8605818 counting only the distinct ones).

The product of its (nonzero) digits is 2359296, while the sum is 52.

The square root of 688464880 is about 26238.6142926794. The cubic root of 688464880 is about 882.9997832469. Note that the first 3 decimals are identical.

The spelling of 688464880 in words is "six hundred eighty-eight million, four hundred sixty-four thousand, eight hundred eighty".