687956 has 24 divisors (see below), whose sum is σ = 1302336. Its totient is φ = 316800.

The previous prime is 687949. The next prime is 687961. The reversal of 687956 is 659786.

It is a happy number.

It is a congruent 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, 4481 + ... + 4631.

It is an arithmetic number, because the mean of its divisors is an integer number (54264).

2⁶⁸⁷⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

687956 is a deficient number, since it is larger than the sum of its proper divisors (614380).

687956 is a wasteful number, since it uses less digits than its factorization.

687956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 237 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 687956 is about 829.4311303538. The cubic root of 687956 is about 88.2782172686.

The spelling of 687956 in words is "six hundred eighty-seven thousand, nine hundred fifty-six".