681838056 has 48 divisors (see below), whose sum is σ = 1906220160. Its totient is φ = 219947040.

The previous prime is 681838049. The next prime is 681838067. The reversal of 681838056 is 650838186.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150510 + ... + 154973.

It is an arithmetic number, because the mean of its divisors is an integer number (39712920).

Almost surely, 2^681838056 is an apocalyptic number.

It is an amenable number.

681838056 is an abundant number, since it is smaller than the sum of its proper divisors (1224382104).

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

681838056 is a wasteful number, since it uses less digits than its factorization.

681838056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305526 (or 305519 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 681838056 is about 26112.0289521898. The cubic root of 681838056 is about 880.1575372231.

The spelling of 681838056 in words is "six hundred eighty-one million, eight hundred thirty-eight thousand, fifty-six".