90090023 has 4 divisors (see below), whose sum is σ = 92006880. Its totient is φ = 88173168.

The previous prime is 90089971. The next prime is 90090043. The reversal of 90090023 is 32009009.

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

It is a cyclic number.

It is not a de Polignac number, because 90090023 - 2⁸ = 90089767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90090043) 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, 958358 + ... + 958451.

It is an arithmetic number, because the mean of its divisors is an integer number (23001720).

Almost surely, 2^90090023 is an apocalyptic number.

90090023 is a deficient number, since it is larger than the sum of its proper divisors (1916857).

90090023 is a wasteful number, since it uses less digits than its factorization.

90090023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916856.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 90090023 is about 9491.5764233345. The cubic root of 90090023 is about 448.2898431977.

The spelling of 90090023 in words is "ninety million, ninety thousand, twenty-three".