681539888 has 20 divisors (see below), whose sum is σ = 1321020360. Its totient is φ = 340631424.

The previous prime is 681539851. The next prime is 681539891. The reversal of 681539888 is 888935186.

681539888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40331 + ... + 54677.

It is an arithmetic number, because the mean of its divisors is an integer number (66051018).

Almost surely, 2^681539888 is an apocalyptic number.

It is an amenable number.

681539888 is a deficient number, since it is larger than the sum of its proper divisors (639480472).

681539888 is a wasteful number, since it uses less digits than its factorization.

681539888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17324 (or 17318 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 56.

The square root of 681539888 is about 26106.3189285659. The cubic root of 681539888 is about 880.0292207928.

The spelling of 681539888 in words is "six hundred eighty-one million, five hundred thirty-nine thousand, eight hundred eighty-eight".