81327272 has 32 divisors (see below), whose sum is σ = 168232680. Its totient is φ = 36618240.

The previous prime is 81327271. The next prime is 81327293. The reversal of 81327272 is 27272318.

It can be written as a sum of positive squares in 4 ways, for example, as 10329796 + 70997476 = 3214^2 + 8426^2 .

It is a super-2 number, since 2×81327272² = 13228250341923968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81327271) by changing a digit.

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, 5273 + ... + 13800.

Almost surely, 2^81327272 is an apocalyptic number.

81327272 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

81327272 is an abundant number, since it is smaller than the sum of its proper divisors (86905408).

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

81327272 is a wasteful number, since it uses less digits than its factorization.

81327272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19133 (or 19129 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 81327272 is about 9018.1634493948. The cubic root of 81327272 is about 433.2568138391.

The spelling of 81327272 in words is "eighty-one million, three hundred twenty-seven thousand, two hundred seventy-two".