681813898 has 16 divisors (see below), whose sum is σ = 1077056640. Its totient is φ = 322812000.

The previous prime is 681813871. The next prime is 681813901. The reversal of 681813898 is 898318186.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157503 + ... + 161773.

It is an arithmetic number, because the mean of its divisors is an integer number (67316040).

Almost surely, 2^681813898 is an apocalyptic number.

681813898 is a deficient number, since it is larger than the sum of its proper divisors (395242742).

681813898 is a wasteful number, since it uses less digits than its factorization.

681813898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8493.

The product of its digits is 663552, while the sum is 52.

The square root of 681813898 is about 26111.5663643528. The cubic root of 681813898 is about 880.1471422342.

The spelling of 681813898 in words is "six hundred eighty-one million, eight hundred thirteen thousand, eight hundred ninety-eight".