81113808 has 40 divisors (see below), whose sum is σ = 212504256. Its totient is φ = 26656000.

The previous prime is 81113779. The next prime is 81113819. The reversal of 81113808 is 80831118.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 8493 + ... + 15308.

Almost surely, 2^81113808 is an apocalyptic number.

It is an amenable number.

81113808 is an abundant number, since it is smaller than the sum of its proper divisors (131390448).

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

81113808 is a wasteful number, since it uses less digits than its factorization.

81113808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23883 (or 23877 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 81113808 is about 9006.3204473303. The cubic root of 81113808 is about 432.8774176663.

The spelling of 81113808 in words is "eighty-one million, one hundred thirteen thousand, eight hundred eight".