90090623 has 4 divisors (see below), whose sum is σ = 102960720. Its totient is φ = 77220528.

The previous prime is 90090577. The next prime is 90090629. The reversal of 90090623 is 32609009.

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

It is not a de Polignac number, because 90090623 - 2⁸ = 90090367 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 (90090629) 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, 6435038 + ... + 6435051.

It is an arithmetic number, because the mean of its divisors is an integer number (25740180).

Almost surely, 2^90090623 is an apocalyptic number.

90090623 is a deficient number, since it is larger than the sum of its proper divisors (12870097).

90090623 is a wasteful number, since it uses less digits than its factorization.

90090623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12870096.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 90090623 is about 9491.6080302549. The cubic root of 90090623 is about 448.2908383997.

The spelling of 90090623 in words is "ninety million, ninety thousand, six hundred twenty-three".