686681172 has 48 divisors (see below), whose sum is σ = 1783163200. Its totient is φ = 228523680.

The previous prime is 686681159. The next prime is 686681173. The reversal of 686681172 is 271186686.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686681173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66579 + ... + 76197.

Almost surely, 2^686681172 is an apocalyptic number.

It is an amenable number.

686681172 is an abundant number, since it is smaller than the sum of its proper divisors (1096482028).

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

686681172 is a wasteful number, since it uses less digits than its factorization.

686681172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10293 (or 10285 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 686681172 is about 26204.6021148958. The cubic root of 686681172 is about 882.2365509254.

The spelling of 686681172 in words is "six hundred eighty-six million, six hundred eighty-one thousand, one hundred seventy-two".