81500272 has 40 divisors (see below), whose sum is σ = 189968000. Its totient is φ = 33089472.

The previous prime is 81500219. The next prime is 81500297. The reversal of 81500272 is 27200518.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 17022 + ... + 21277.

It is an arithmetic number, because the mean of its divisors is an integer number (4749200).

Almost surely, 2^81500272 is an apocalyptic number.

It is an amenable number.

81500272 is an abundant number, since it is smaller than the sum of its proper divisors (108467728).

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

81500272 is a wasteful number, since it uses less digits than its factorization.

81500272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38333 (or 38327 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 81500272 is about 9027.7501073080. The cubic root of 81500272 is about 433.5638053419.

The spelling of 81500272 in words is "eighty-one million, five hundred thousand, two hundred seventy-two".