81527172 has 24 divisors (see below), whose sum is σ = 201420576. Its totient is φ = 25577088.

The previous prime is 81527153. The next prime is 81527177. The reversal of 81527172 is 27172518.

It is not an unprimeable number, because it can be changed into a prime (81527177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199618 + ... + 200025.

It is an arithmetic number, because the mean of its divisors is an integer number (8392524).

Almost surely, 2^81527172 is an apocalyptic number.

It is an amenable number.

81527172 is an abundant number, since it is smaller than the sum of its proper divisors (119893404).

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

81527172 is a wasteful number, since it uses less digits than its factorization.

81527172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399667 (or 399665 counting only the distinct ones).

The product of its digits is 7840, while the sum is 33.

The square root of 81527172 is about 9029.2398351135. The cubic root of 81527172 is about 433.6115008206.

The spelling of 81527172 in words is "eighty-one million, five hundred twenty-seven thousand, one hundred seventy-two".