681489868 has 6 divisors (see below), whose sum is σ = 1192607276. Its totient is φ = 340744932.

The previous prime is 681489859. The next prime is 681489881. The reversal of 681489868 is 868984186.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85186230 + ... + 85186237.

Almost surely, 2^681489868 is an apocalyptic number.

It is an amenable number.

681489868 is a deficient number, since it is larger than the sum of its proper divisors (511117408).

681489868 is a wasteful number, since it uses less digits than its factorization.

681489868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170372471 (or 170372469 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 58.

The square root of 681489868 is about 26105.3609053773. The cubic root of 681489868 is about 880.0076910485.

The spelling of 681489868 in words is "six hundred eighty-one million, four hundred eighty-nine thousand, eight hundred sixty-eight".