89731728 has 60 divisors (see below), whose sum is σ = 252987280. Its totient is φ = 29688768.

The previous prime is 89731711. The next prime is 89731751. The reversal of 89731728 is 82713798.

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 11 ways as a sum of consecutive naturals, for example, 17775 + ... + 22257.

Almost surely, 2^89731728 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 89731728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126493640).

89731728 is an abundant number, since it is smaller than the sum of its proper divisors (163255552).

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

89731728 is a wasteful number, since it uses less digits than its factorization.

89731728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636 (or 4627 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 89731728 is about 9472.6832523842. The cubic root of 89731728 is about 447.6947591234.

It can be divided in two parts, 8973 and 1728, that added together give a palindrome (10701).

The spelling of 89731728 in words is "eighty-nine million, seven hundred thirty-one thousand, seven hundred twenty-eight".