681899934 has 32 divisors (see below), whose sum is σ = 1419200640. Its totient is φ = 218246112.

The previous prime is 681899927. The next prime is 681900013. The reversal of 681899934 is 439998186.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7177 + ... + 37620.

It is an arithmetic number, because the mean of its divisors is an integer number (44350020).

Almost surely, 2^681899934 is an apocalyptic number.

681899934 is an abundant number, since it is smaller than the sum of its proper divisors (737300706).

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

681899934 is a wasteful number, since it uses less digits than its factorization.

681899934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44904.

The product of its digits is 3359232, while the sum is 57.

The square root of 681899934 is about 26113.2137815321. The cubic root of 681899934 is about 880.1841616980.

The spelling of 681899934 in words is "six hundred eighty-one million, eight hundred ninety-nine thousand, nine hundred thirty-four".