681890912 has 24 divisors (see below), whose sum is σ = 1345491000. Its totient is φ = 340178944.

The previous prime is 681890903. The next prime is 681890917. The reversal of 681890912 is 219098186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681890917) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9362 + ... + 38097.

It is an arithmetic number, because the mean of its divisors is an integer number (56062125).

Almost surely, 2^681890912 is an apocalyptic number.

It is an amenable number.

681890912 is a deficient number, since it is larger than the sum of its proper divisors (663600088).

681890912 is a wasteful number, since it uses less digits than its factorization.

681890912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47918 (or 47910 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 681890912 is about 26113.0410331696. The cubic root of 681890912 is about 880.1802798691.

The spelling of 681890912 in words is "six hundred eighty-one million, eight hundred ninety thousand, nine hundred twelve".