90090918 has 24 divisors (see below), whose sum is σ = 195799656. Its totient is φ = 29937600.

The previous prime is 90090911. The next prime is 90090941. The reversal of 90090918 is 81909009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90090911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1603 + ... + 13518.

It is an arithmetic number, because the mean of its divisors is an integer number (8158319).

Almost surely, 2^90090918 is an apocalyptic number.

90090918 is an abundant number, since it is smaller than the sum of its proper divisors (105708738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90090918 is a wasteful number, since it uses less digits than its factorization.

90090918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15460 (or 15457 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 90090918 is about 9491.6235702855. The cubic root of 90090918 is about 448.2913277057.

The spelling of 90090918 in words is "ninety million, ninety thousand, nine hundred eighteen".