688604 has 12 divisors (see below), whose sum is σ = 1377264. Its totient is φ = 295104.

The previous prime is 688591. The next prime is 688621. The reversal of 688604 is 406886.

688604 is an admirable number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 688604.

It is an unprimeable number.

688604 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12269 + ... + 12324.

It is an arithmetic number, because the mean of its divisors is an integer number (114772).

2⁶⁸⁸⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

688604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

688604 is a wasteful number, since it uses less digits than its factorization.

688604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24604 (or 24602 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 688604 is about 829.8216675889. The cubic root of 688604 is about 88.3059255976.

The spelling of 688604 in words is "six hundred eighty-eight thousand, six hundred four".