89724921 has 32 divisors (see below), whose sum is σ = 141388800. Its totient is φ = 49896000.

The previous prime is 89724907. The next prime is 89724941. The reversal of 89724921 is 12942798.

It is not a de Polignac number, because 89724921 - 2¹¹ = 89722873 is a prime.

It is a super-2 number, since 2×89724921² = 16101122896912482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (89724941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84846 + ... + 85896.

It is an arithmetic number, because the mean of its divisors is an integer number (4418400).

Almost surely, 2^89724921 is an apocalyptic number.

It is an amenable number.

89724921 is a deficient number, since it is larger than the sum of its proper divisors (51663879).

89724921 is a wasteful number, since it uses less digits than its factorization.

89724921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277.

The product of its digits is 72576, while the sum is 42.

The square root of 89724921 is about 9472.3239492745. The cubic root of 89724921 is about 447.6834382102.

The spelling of 89724921 in words is "eighty-nine million, seven hundred twenty-four thousand, nine hundred twenty-one".