686604 has 24 divisors (see below), whose sum is σ = 1658160. Its totient is φ = 220864.

The previous prime is 686593. The next prime is 686611. The reversal of 686604 is 406686.

It is a happy number.

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, 639 + ... + 1334.

It is an arithmetic number, because the mean of its divisors is an integer number (69090).

2⁶⁸⁶⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

686604 is an abundant number, since it is smaller than the sum of its proper divisors (971556).

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

686604 is a wasteful number, since it uses less digits than its factorization.

686604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009 (or 2007 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 686604 is about 828.6157131023. The cubic root of 686604 is about 88.2203499920.

The spelling of 686604 in words is "six hundred eighty-six thousand, six hundred four".