90040233 has 4 divisors (see below), whose sum is σ = 120053648. Its totient is φ = 60026820.

The previous prime is 90040199. The next prime is 90040289. The reversal of 90040233 is 33204009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 90040233 - 2¹² = 90036137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90044233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15006703 + ... + 15006708.

It is an arithmetic number, because the mean of its divisors is an integer number (30013412).

Almost surely, 2^90040233 is an apocalyptic number.

It is an amenable number.

90040233 is a deficient number, since it is larger than the sum of its proper divisors (30013415).

90040233 is a wasteful number, since it uses less digits than its factorization.

90040233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30013414.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 90040233 is about 9488.9532088635. The cubic root of 90040233 is about 448.2072426176.

The spelling of 90040233 in words is "ninety million, forty thousand, two hundred thirty-three".