89565728 has 54 divisors (see below), whose sum is σ = 205983351. Its totient is φ = 38224704.

The previous prime is 89565713. The next prime is 89565731. The reversal of 89565728 is 82756598.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 44782864 + 44782864 = 6692^2 + 6692^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=6692.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 374633 + ... + 374871.

Almost surely, 2^89565728 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 89565728

89565728 is an abundant number, since it is smaller than the sum of its proper divisors (116417623).

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

89565728 is an equidigital number, since it uses as much as digits as its factorization.

89565728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502 (or 248 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 50.

The square root of 89565728 is about 9463.9171594008. The cubic root of 89565728 is about 447.4185164207.

Multiplying 89565728 by its sum of digits (50), we get a square (4478286400 = 66920²).

The spelling of 89565728 in words is "eighty-nine million, five hundred sixty-five thousand, seven hundred twenty-eight".