681999982 has 16 divisors (see below), whose sum is σ = 1085409072. Its totient is φ = 320279680.

The previous prime is 681999971. The next prime is 681999991. The reversal of 681999982 is 289999186.

It is a self number, because there is not a number n which added to its sum of digits gives 681999982.

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 7 ways as a sum of consecutive naturals, for example, 3733 + ... + 37120.

It is an arithmetic number, because the mean of its divisors is an integer number (67838067).

Almost surely, 2^681999982 is an apocalyptic number.

681999982 is a deficient number, since it is larger than the sum of its proper divisors (403409090).

681999982 is a wasteful number, since it uses less digits than its factorization.

681999982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41363.

The product of its digits is 5038848, while the sum is 61.

The square root of 681999982 is about 26115.1293697734. The cubic root of 681999982 is about 880.2272063121.

The spelling of 681999982 in words is "six hundred eighty-one million, nine hundred ninety-nine thousand, nine hundred eighty-two".