89121728 has 14 divisors (see below), whose sum is σ = 176851056. Its totient is φ = 44560832.

The previous prime is 89121713. The next prime is 89121731. The reversal of 89121728 is 82712198.

It is a junction number, because it is equal to n+sod(n) for n = 89121691 and 89121700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696200 + ... + 696327.

Almost surely, 2^89121728 is an apocalyptic number.

It is an amenable number.

89121728 is a deficient number, since it is larger than the sum of its proper divisors (87729328).

89121728 is a wasteful number, since it uses less digits than its factorization.

89121728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392539 (or 1392529 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The square root of 89121728 is about 9440.4304986584. The cubic root of 89121728 is about 446.6779690712.

The spelling of 89121728 in words is "eighty-nine million, one hundred twenty-one thousand, seven hundred twenty-eight".