81888996 has 36 divisors (see below), whose sum is σ = 222271728. Its totient is φ = 23396688.

The previous prime is 81888973. The next prime is 81889007. The reversal of 81888996 is 69988818.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69046 + ... + 70221.

Almost surely, 2^81888996 is an apocalyptic number.

It is an amenable number.

81888996 is an abundant number, since it is smaller than the sum of its proper divisors (140382732).

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

81888996 is a wasteful number, since it uses less digits than its factorization.

81888996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139288 (or 139279 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 57.

The square root of 81888996 is about 9049.2538918963. The cubic root of 81888996 is about 434.2520215048.

The spelling of 81888996 in words is "eighty-one million, eight hundred eighty-eight thousand, nine hundred ninety-six".