687696 has 20 divisors (see below), whose sum is σ = 1776672. Its totient is φ = 229216.

The previous prime is 687691. The next prime is 687707. The reversal of 687696 is 696786.

It is a happy number.

687696 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687691) by changing a digit.

687696 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, 7116 + ... + 7211.

2⁶⁸⁷⁶⁹⁶ is an apocalyptic number.

It is an amenable number.

687696 is an abundant number, since it is smaller than the sum of its proper divisors (1088976).

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

687696 is a wasteful number, since it uses less digits than its factorization.

687696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14338 (or 14332 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 687696 is about 829.2743816132. The cubic root of 687696 is about 88.2670948380.

The spelling of 687696 in words is "six hundred eighty-seven thousand, six hundred ninety-six".