81525056 has 28 divisors (see below), whose sum is σ = 165727380. Its totient is φ = 39767040.

The previous prime is 81524999. The next prime is 81525089. The reversal of 81525056 is 65052518.

It can be written as a sum of positive squares in 2 ways, for example, as 21307456 + 60217600 = 4616^2 + 7760^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12911 + ... + 18158.

It is an arithmetic number, because the mean of its divisors is an integer number (5918835).

Almost surely, 2^81525056 is an apocalyptic number.

It is an amenable number.

81525056 is an abundant number, since it is smaller than the sum of its proper divisors (84202324).

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

81525056 is a wasteful number, since it uses less digits than its factorization.

81525056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31122 (or 31112 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 81525056 is about 9029.1226594836. The cubic root of 81525056 is about 433.6077493929.

The spelling of 81525056 in words is "eighty-one million, five hundred twenty-five thousand, fifty-six".