681907924 has 24 divisors (see below), whose sum is σ = 1213581600. Its totient is φ = 335219040.

The previous prime is 681907903. The next prime is 681907931. The reversal of 681907924 is 429709186.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51147 + ... + 63085.

It is an arithmetic number, because the mean of its divisors is an integer number (50565900).

Almost surely, 2^681907924 is an apocalyptic number.

It is an amenable number.

681907924 is a deficient number, since it is larger than the sum of its proper divisors (531673676).

681907924 is a wasteful number, since it uses less digits than its factorization.

681907924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12183 (or 12181 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 681907924 is about 26113.3667687642. The cubic root of 681907924 is about 880.1875994673.

The spelling of 681907924 in words is "six hundred eighty-one million, nine hundred seven thousand, nine hundred twenty-four".