681719568 has 20 divisors (see below), whose sum is σ = 1761109008. Its totient is φ = 227239840.

The previous prime is 681719557. The next prime is 681719603. The reversal of 681719568 is 865917186.

It is a self number, because there is not a number n which added to its sum of digits gives 681719568.

It is an unprimeable number.

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, 7101198 + ... + 7101293.

Almost surely, 2^681719568 is an apocalyptic number.

It is an amenable number.

681719568 is an abundant number, since it is smaller than the sum of its proper divisors (1079389440).

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

681719568 is a wasteful number, since it uses less digits than its factorization.

681719568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14202502 (or 14202496 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

The square root of 681719568 is about 26109.7600142169. The cubic root of 681719568 is about 880.1065504592.

The spelling of 681719568 in words is "six hundred eighty-one million, seven hundred nineteen thousand, five hundred sixty-eight".