687884 has 12 divisors (see below), whose sum is σ = 1256304. Its totient is φ = 328944.

The previous prime is 687847. The next prime is 687893. The reversal of 687884 is 488786.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3647 + ... + 3830.

It is an arithmetic number, because the mean of its divisors is an integer number (104692).

2⁶⁸⁷⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

687884 is a deficient number, since it is larger than the sum of its proper divisors (568420).

687884 is a wasteful number, since it uses less digits than its factorization.

687884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7504 (or 7502 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The square root of 687884 is about 829.3877259762. The cubic root of 687884 is about 88.2751374915.

The spelling of 687884 in words is "six hundred eighty-seven thousand, eight hundred eighty-four".