688556 has 12 divisors (see below), whose sum is σ = 1314600. Its totient is φ = 312960.

The previous prime is 688543. The next prime is 688561. The reversal of 688556 is 655886.

It is an unprimeable number.

688556 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, 7781 + ... + 7868.

It is an arithmetic number, because the mean of its divisors is an integer number (109550).

2⁶⁸⁸⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

688556 is a deficient number, since it is larger than the sum of its proper divisors (626044).

688556 is a wasteful number, since it uses less digits than its factorization.

688556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15664 (or 15662 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 688556 is about 829.7927452081. The cubic root of 688556 is about 88.3038737251.

The spelling of 688556 in words is "six hundred eighty-eight thousand, five hundred fifty-six".