686681224 has 64 divisors (see below), whose sum is σ = 1354429440. Its totient is φ = 326073600.

The previous prime is 686681213. The next prime is 686681231. The reversal of 686681224 is 422186686.

686681224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×686681224² = 943062206788276352, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3079177 + ... + 3079399.

It is an arithmetic number, because the mean of its divisors is an integer number (21162960).

Almost surely, 2^686681224 is an apocalyptic number.

It is an amenable number.

686681224 is a deficient number, since it is larger than the sum of its proper divisors (667748216).

686681224 is a wasteful number, since it uses less digits than its factorization.

686681224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 466 counting only the distinct ones).

The product of its digits is 221184, while the sum is 43.

The square root of 686681224 is about 26204.6031070879. The cubic root of 686681224 is about 882.2365731950.

The spelling of 686681224 in words is "six hundred eighty-six million, six hundred eighty-one thousand, two hundred twenty-four".