81552528 has 40 divisors (see below), whose sum is σ = 234087200. Its totient is φ = 27184032.

The previous prime is 81552509. The next prime is 81552529. The reversal of 81552528 is 82525518.

81552528 is a `hidden beast` number, since 81 + 5 + 52 + 528 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 81552492 and 81552501.

It is not an unprimeable number, because it can be changed into a prime (81552529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93958 + ... + 94821.

It is an arithmetic number, because the mean of its divisors is an integer number (5852180).

Almost surely, 2^81552528 is an apocalyptic number.

It is an amenable number.

81552528 is an abundant number, since it is smaller than the sum of its proper divisors (152534672).

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

81552528 is a wasteful number, since it uses less digits than its factorization.

81552528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188796 (or 188784 counting only the distinct ones).

The product of its digits is 32000, while the sum is 36.

The square root of 81552528 is about 9030.6438308683. The cubic root of 81552528 is about 433.6564490806.

The spelling of 81552528 in words is "eighty-one million, five hundred fifty-two thousand, five hundred twenty-eight".