89731809 has 24 divisors (see below), whose sum is σ = 137816640. Its totient is φ = 56133792.

The previous prime is 89731801. The next prime is 89731843. The reversal of 89731809 is 90813798.

It is not a de Polignac number, because 89731809 - 2³ = 89731801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (89731801) 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 23 ways as a sum of consecutive naturals, for example, 6882 + ... + 15060.

It is an arithmetic number, because the mean of its divisors is an integer number (5742360).

Almost surely, 2^89731809 is an apocalyptic number.

It is an amenable number.

89731809 is a deficient number, since it is larger than the sum of its proper divisors (48084831).

89731809 is a wasteful number, since it uses less digits than its factorization.

89731809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8261 (or 8258 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 89731809 is about 9472.6875278350. The cubic root of 89731809 is about 447.6948938333.

The spelling of 89731809 in words is "eighty-nine million, seven hundred thirty-one thousand, eight hundred nine".