81271296 has 80 divisors (see below), whose sum is σ = 240609600. Its totient is φ = 27085824.

The previous prime is 81271241. The next prime is 81271297. The reversal of 81271296 is 69217218.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81271296.

It is not an unprimeable number, because it can be changed into a prime (81271297) 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, 10885 + ... + 16763.

It is an arithmetic number, because the mean of its divisors is an integer number (3007620).

Almost surely, 2^81271296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81271296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120304800).

81271296 is an abundant number, since it is smaller than the sum of its proper divisors (159338304).

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

81271296 is an equidigital number, since it uses as much as digits as its factorization.

81271296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5906 (or 5884 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 81271296 is about 9015.0594008026. The cubic root of 81271296 is about 433.1573902428.

The spelling of 81271296 in words is "eighty-one million, two hundred seventy-one thousand, two hundred ninety-six".