81456528 has 40 divisors (see below), whose sum is σ = 211298976. Its totient is φ = 27040000.

The previous prime is 81456527. The next prime is 81456541. The reversal of 81456528 is 82565418.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (81456527) 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, 8668 + ... + 15428.

Almost surely, 2^81456528 is an apocalyptic number.

It is an amenable number.

81456528 is an abundant number, since it is smaller than the sum of its proper divisors (129842448).

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

81456528 is a wasteful number, since it uses less digits than its factorization.

81456528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7023 (or 7017 counting only the distinct ones).

The product of its digits is 76800, while the sum is 39.

The square root of 81456528 is about 9025.3270300859. The cubic root of 81456528 is about 433.4862219227.

The spelling of 81456528 in words is "eighty-one million, four hundred fifty-six thousand, five hundred twenty-eight".