90023891 has 8 divisors (see below), whose sum is σ = 95722560. Its totient is φ = 84370048.

The previous prime is 90023873. The next prime is 90023893. The reversal of 90023891 is 19832009.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90023891 - 2¹⁴ = 90007507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90023893) 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 7 ways as a sum of consecutive naturals, for example, 7016 + ... + 15141.

It is an arithmetic number, because the mean of its divisors is an integer number (11965320).

Almost surely, 2^90023891 is an apocalyptic number.

90023891 is a deficient number, since it is larger than the sum of its proper divisors (5698669).

90023891 is a wasteful number, since it uses less digits than its factorization.

90023891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22413.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 90023891 is about 9488.0920632127. The cubic root of 90023891 is about 448.1801249403.

The spelling of 90023891 in words is "ninety million, twenty-three thousand, eight hundred ninety-one".