681589376 has 32 divisors (see below), whose sum is σ = 1462307700. Its totient is φ = 314578944.

The previous prime is 681589367. The next prime is 681589409. The reversal of 681589376 is 673985186.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 656589376 + 25000000 = 25624^2 + 5000^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 203141 + ... + 206468.

Almost surely, 2^681589376 is an apocalyptic number.

It is an amenable number.

681589376 is an abundant number, since it is smaller than the sum of its proper divisors (780718324).

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

681589376 is a wasteful number, since it uses less digits than its factorization.

681589376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409636 (or 409624 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 53.

The square root of 681589376 is about 26107.2667278672. The cubic root of 681589376 is about 880.0505205156.

The spelling of 681589376 in words is "six hundred eighty-one million, five hundred eighty-nine thousand, three hundred seventy-six".