688643080 has 16 divisors (see below), whose sum is σ = 1549447020. Its totient is φ = 275457216.

The previous prime is 688643063. The next prime is 688643099. The reversal of 688643080 is 80346886.

It can be written as a sum of positive squares in 2 ways, for example, as 653620356 + 35022724 = 25566^2 + 5918^2 .

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, 8607999 + ... + 8608078.

Almost surely, 2^688643080 is an apocalyptic number.

It is an amenable number.

688643080 is an abundant number, since it is smaller than the sum of its proper divisors (860803940).

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

688643080 is a wasteful number, since it uses less digits than its factorization.

688643080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17216088 (or 17216084 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 688643080 is about 26242.0098315659. The cubic root of 688643080 is about 883.0759609343.

The spelling of 688643080 in words is "six hundred eighty-eight million, six hundred forty-three thousand, eighty".