687856 has 20 divisors (see below), whose sum is σ = 1435672. Its totient is φ = 317376.

The previous prime is 687847. The next prime is 687893. The reversal of 687856 is 658786.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1446 + ... + 1861.

2⁶⁸⁷⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

687856 is an abundant number, since it is smaller than the sum of its proper divisors (747816).

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

687856 is a wasteful number, since it uses less digits than its factorization.

687856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3328 (or 3322 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 687856 is about 829.3708458826. The cubic root of 687856 is about 88.2739397424.

The spelling of 687856 in words is "six hundred eighty-seven thousand, eight hundred fifty-six".