688218872 has 16 divisors (see below), whose sum is σ = 1407720600. Its totient is φ = 312826720.

The previous prime is 688218859. The next prime is 688218887. The reversal of 688218872 is 278812886.

It is a self number, because there is not a number n which added to its sum of digits gives 688218872.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3910247 + ... + 3910422.

Almost surely, 2^688218872 is an apocalyptic number.

It is an amenable number.

688218872 is an abundant number, since it is smaller than the sum of its proper divisors (719501728).

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

688218872 is a wasteful number, since it uses less digits than its factorization.

688218872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7820686 (or 7820682 counting only the distinct ones).

The product of its digits is 688128, while the sum is 50.

The square root of 688218872 is about 26233.9259738225. The cubic root of 688218872 is about 882.8945971070.

The spelling of 688218872 in words is "six hundred eighty-eight million, two hundred eighteen thousand, eight hundred seventy-two".