81332808 has 32 divisors (see below), whose sum is σ = 208829760. Its totient is φ = 26377920.

The previous prime is 81332759. The next prime is 81332813. The reversal of 81332808 is 80823318.

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, 44908 + ... + 46683.

It is an arithmetic number, because the mean of its divisors is an integer number (6525930).

Almost surely, 2^81332808 is an apocalyptic number.

It is an amenable number.

81332808 is an abundant number, since it is smaller than the sum of its proper divisors (127496952).

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

81332808 is a wasteful number, since it uses less digits than its factorization.

81332808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91637 (or 91633 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 81332808 is about 9018.4703802807. The cubic root of 81332808 is about 433.2666443066.

The spelling of 81332808 in words is "eighty-one million, three hundred thirty-two thousand, eight hundred eight".