681855982 has 8 divisors (see below), whose sum is σ = 1022981400. Its totient is φ = 340862184.

The previous prime is 681855901. The next prime is 681856001. The reversal of 681855982 is 289558186.

681855982 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 18732 + ... + 41407.

It is an arithmetic number, because the mean of its divisors is an integer number (127872675).

Almost surely, 2^681855982 is an apocalyptic number.

681855982 is a deficient number, since it is larger than the sum of its proper divisors (341125418).

681855982 is a wasteful number, since it uses less digits than its factorization.

681855982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65810.

The product of its digits is 1382400, while the sum is 52.

The square root of 681855982 is about 26112.3722016978. The cubic root of 681855982 is about 880.1652504748.

The spelling of 681855982 in words is "six hundred eighty-one million, eight hundred fifty-five thousand, nine hundred eighty-two".