686681204 has 72 divisors (see below), whose sum is σ = 1465527168. Its totient is φ = 278196480.

The previous prime is 686681189. The next prime is 686681213. The reversal of 686681204 is 402186686.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268757 + ... + 271299.

It is an arithmetic number, because the mean of its divisors is an integer number (20354544).

Almost surely, 2^686681204 is an apocalyptic number.

It is an amenable number.

686681204 is an abundant number, since it is smaller than the sum of its proper divisors (778845964).

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

686681204 is a wasteful number, since it uses less digits than its factorization.

686681204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613 (or 2592 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 686681204 is about 26204.6027254755. The cubic root of 686681204 is about 882.2365646298.

The spelling of 686681204 in words is "six hundred eighty-six million, six hundred eighty-one thousand, two hundred four".