89445728 has 24 divisors (see below), whose sum is σ = 176767920. Its totient is φ = 44552320.

The previous prime is 89445679. The next prime is 89445731. The reversal of 89445728 is 82754498.

It is a happy number.

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, 3413 + ... + 13803.

It is an arithmetic number, because the mean of its divisors is an integer number (7365330).

Almost surely, 2^89445728 is an apocalyptic number.

It is an amenable number.

89445728 is a deficient number, since it is larger than the sum of its proper divisors (87322192).

89445728 is a wasteful number, since it uses less digits than its factorization.

89445728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10670 (or 10662 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 89445728 is about 9457.5751649141. The cubic root of 89445728 is about 447.2186102771.

The spelling of 89445728 in words is "eighty-nine million, four hundred forty-five thousand, seven hundred twenty-eight".