687885 has 24 divisors (see below), whose sum is σ = 1212960. Its totient is φ = 332640.

The previous prime is 687847. The next prime is 687893. The reversal of 687885 is 588786.

It is a happy number.

It is not a de Polignac number, because 687885 - 2¹² = 683789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1626 + ... + 2004.

It is an arithmetic number, because the mean of its divisors is an integer number (50540).

2⁶⁸⁷⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

687885 is a deficient number, since it is larger than the sum of its proper divisors (525075).

687885 is a wasteful number, since it uses less digits than its factorization.

687885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 398 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 687885 is about 829.3883288303. The cubic root of 687885 is about 88.2751802677.

Subtracting from 687885 its reverse (588786), we obtain a palindrome (99099).

The spelling of 687885 in words is "six hundred eighty-seven thousand, eight hundred eighty-five".