81271568 has 20 divisors (see below), whose sum is σ = 179958720. Its totient is φ = 34830624.

The previous prime is 81271559. The next prime is 81271571. The reversal of 81271568 is 86517218.

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, 362708 + ... + 362931.

It is an arithmetic number, because the mean of its divisors is an integer number (8997936).

Almost surely, 2^81271568 is an apocalyptic number.

It is an amenable number.

81271568 is an abundant number, since it is smaller than the sum of its proper divisors (98687152).

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

81271568 is a wasteful number, since it uses less digits than its factorization.

81271568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725654 (or 725648 counting only the distinct ones).

The product of its digits is 26880, while the sum is 38.

The square root of 81271568 is about 9015.0744866584. The cubic root of 81271568 is about 433.1578734748.

The spelling of 81271568 in words is "eighty-one million, two hundred seventy-one thousand, five hundred sixty-eight".