681489568 has 24 divisors (see below), whose sum is σ = 1412298720. Its totient is φ = 322810560.

The previous prime is 681489559. The next prime is 681489583. The reversal of 681489568 is 865984186.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559828 + ... + 561043.

It is an arithmetic number, because the mean of its divisors is an integer number (58845780).

Almost surely, 2^681489568 is an apocalyptic number.

It is an amenable number.

681489568 is an abundant number, since it is smaller than the sum of its proper divisors (730809152).

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

681489568 is a wasteful number, since it uses less digits than its factorization.

681489568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120900 (or 1120892 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 55.

The square root of 681489568 is about 26105.3551594304. The cubic root of 681489568 is about 880.0075619185.

The spelling of 681489568 in words is "six hundred eighty-one million, four hundred eighty-nine thousand, five hundred sixty-eight".