81475888 has 20 divisors (see below), whose sum is σ = 170003008. Its totient is φ = 37604160.

The previous prime is 81475861. The next prime is 81475903. The reversal of 81475888 is 88857418.

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 3 ways as a sum of consecutive naturals, for example, 195648 + ... + 196063.

Almost surely, 2^81475888 is an apocalyptic number.

It is an amenable number.

81475888 is an abundant number, since it is smaller than the sum of its proper divisors (88527120).

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

81475888 is a wasteful number, since it uses less digits than its factorization.

81475888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391732 (or 391726 counting only the distinct ones).

The product of its digits is 573440, while the sum is 49.

The square root of 81475888 is about 9026.3995036781. The cubic root of 81475888 is about 433.5205618284.

The spelling of 81475888 in words is "eighty-one million, four hundred seventy-five thousand, eight hundred eighty-eight".