687404 has 6 divisors (see below), whose sum is σ = 1202964. Its totient is φ = 343700.

The previous prime is 687403. The next prime is 687413. The reversal of 687404 is 404786.

It is not an unprimeable number, because it can be changed into a prime (687403) by changing a digit.

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 as a sum of consecutive naturals, namely, 85922 + ... + 85929.

It is an arithmetic number, because the mean of its divisors is an integer number (200494).

2⁶⁸⁷⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

687404 is a deficient number, since it is larger than the sum of its proper divisors (515560).

687404 is a wasteful number, since it uses less digits than its factorization.

687404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171855 (or 171853 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 687404 is about 829.0983053897. The cubic root of 687404 is about 88.2546001502.

The spelling of 687404 in words is "six hundred eighty-seven thousand, four hundred four".