81701808 has 20 divisors (see below), whose sum is σ = 211063128. Its totient is φ = 27233920.

The previous prime is 81701791. The next prime is 81701821. The reversal of 81701808 is 80810718.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851013 + ... + 851108.

Almost surely, 2^81701808 is an apocalyptic number.

It is an amenable number.

81701808 is an abundant number, since it is smaller than the sum of its proper divisors (129361320).

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

81701808 is a wasteful number, since it uses less digits than its factorization.

81701808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702132 (or 1702126 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 33.

The square root of 81701808 is about 9038.9052434462. The cubic root of 81701808 is about 433.9208871348.

The spelling of 81701808 in words is "eighty-one million, seven hundred one thousand, eight hundred eight".