687708 has 36 divisors (see below), whose sum is σ = 1987440. Its totient is φ = 196416.

The previous prime is 687707. The next prime is 687721. The reversal of 687708 is 807786.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 687708.

It is not an unprimeable number, because it can be changed into a prime (687707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1113 + ... + 1616.

2⁶⁸⁷⁷⁰⁸ is an apocalyptic number.

It is an amenable number.

687708 is an abundant number, since it is smaller than the sum of its proper divisors (1299732).

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

687708 is a wasteful number, since it uses less digits than its factorization.

687708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746 (or 2741 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 687708 is about 829.2816168227. The cubic root of 687708 is about 88.2676082427.

It can be divided in two parts, 68 and 7708, that added together give a 5-th power (7776 = 6⁵).

The spelling of 687708 in words is "six hundred eighty-seven thousand, seven hundred eight".