686864172 has 24 divisors (see below), whose sum is σ = 1616869296. Its totient is φ = 226928128.

The previous prime is 686864147. The next prime is 686864183. The reversal of 686864172 is 271468686.

686864172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251913 + ... + 254624.

It is an arithmetic number, because the mean of its divisors is an integer number (67369554).

Almost surely, 2^686864172 is an apocalyptic number.

It is an amenable number.

686864172 is an abundant number, since it is smaller than the sum of its proper divisors (930005124).

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

686864172 is a wasteful number, since it uses less digits than its factorization.

686864172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506657 (or 506655 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 686864172 is about 26208.0936353639. The cubic root of 686864172 is about 882.3149157501.

The spelling of 686864172 in words is "six hundred eighty-six million, eight hundred sixty-four thousand, one hundred seventy-two".