81325056 has 88 divisors (see below), whose sum is σ = 226381824. Its totient is φ = 25907200.

The previous prime is 81325043. The next prime is 81325063. The reversal of 81325056 is 65052318.

It is a super-2 number, since 2×81325056² = 13227529466806272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70081 + ... + 71231.

Almost surely, 2^81325056 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 81325056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113190912).

81325056 is an abundant number, since it is smaller than the sum of its proper divisors (145056768).

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

81325056 is a wasteful number, since it uses less digits than its factorization.

81325056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197 (or 1179 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 81325056 is about 9018.0405854043. The cubic root of 81325056 is about 433.2528786860.

The spelling of 81325056 in words is "eighty-one million, three hundred twenty-five thousand, fifty-six".