89604721 has 4 divisors (see below), whose sum is σ = 91790244. Its totient is φ = 87419200.

The previous prime is 89604719. The next prime is 89604731. The reversal of 89604721 is 12740698.

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 3783025 + 85821696 = 1945^2 + 9264^2 .

It is a cyclic number.

It is not a de Polignac number, because 89604721 - 2¹ = 89604719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89604731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1092700 + ... + 1092781.

It is an arithmetic number, because the mean of its divisors is an integer number (22947561).

Almost surely, 2^89604721 is an apocalyptic number.

It is an amenable number.

89604721 is a deficient number, since it is larger than the sum of its proper divisors (2185523).

89604721 is a wasteful number, since it uses less digits than its factorization.

89604721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185522.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 89604721 is about 9465.9770230019. The cubic root of 89604721 is about 447.4834358173.

The spelling of 89604721 in words is "eighty-nine million, six hundred four thousand, seven hundred twenty-one".