686804 has 12 divisors (see below), whose sum is σ = 1214304. Its totient is φ = 339864.

The previous prime is 686801. The next prime is 686837. The reversal of 686804 is 408686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686801) 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 in 3 ways as a sum of consecutive naturals, for example, 422 + ... + 1245.

It is an arithmetic number, because the mean of its divisors is an integer number (101192).

2⁶⁸⁶⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

686804 is a deficient number, since it is larger than the sum of its proper divisors (527500).

686804 is a wasteful number, since it uses less digits than its factorization.

686804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774 (or 1772 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 686804 is about 828.7363875202. The cubic root of 686804 is about 88.2289150247.

The spelling of 686804 in words is "six hundred eighty-six thousand, eight hundred four".