686880172 has 72 divisors (see below), whose sum is σ = 1466821440. Its totient is φ = 278288640.

The previous prime is 686880169. The next prime is 686880197. The reversal of 686880172 is 271088686.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240183 + ... + 243025.

It is an arithmetic number, because the mean of its divisors is an integer number (20372520).

Almost surely, 2^686880172 is an apocalyptic number.

It is an amenable number.

686880172 is an abundant number, since it is smaller than the sum of its proper divisors (779941268).

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

686880172 is a wasteful number, since it uses less digits than its factorization.

686880172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911 (or 2892 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 686880172 is about 26208.3988828009. The cubic root of 686880172 is about 882.3217666577.

The spelling of 686880172 in words is "six hundred eighty-six million, eight hundred eighty thousand, one hundred seventy-two".