89724209 has 4 divisors (see below), whose sum is σ = 89778420. Its totient is φ = 89670000.

The previous prime is 89724161. The next prime is 89724211. The reversal of 89724209 is 90242798.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21298225 + 68425984 = 4615^2 + 8272^2 .

It is a cyclic number.

It is not a de Polignac number, because 89724209 - 2²⁰ = 88675633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (89726209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24542 + ... + 27959.

It is an arithmetic number, because the mean of its divisors is an integer number (22444605).

Almost surely, 2^89724209 is an apocalyptic number.

It is an amenable number.

89724209 is a deficient number, since it is larger than the sum of its proper divisors (54211).

89724209 is a wasteful number, since it uses less digits than its factorization.

89724209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54210.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 89724209 is about 9472.2863660259. The cubic root of 89724209 is about 447.6822540299.

The spelling of 89724209 in words is "eighty-nine million, seven hundred twenty-four thousand, two hundred nine".