90099918 has 16 divisors (see below), whose sum is σ = 200222160. Its totient is φ = 30033288.

The previous prime is 90099913. The next prime is 90099931. The reversal of 90099918 is 81999009.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90099913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834205 + ... + 834312.

It is an arithmetic number, because the mean of its divisors is an integer number (12513885).

Almost surely, 2^90099918 is an apocalyptic number.

90099918 is an abundant number, since it is smaller than the sum of its proper divisors (110122242).

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

90099918 is a wasteful number, since it uses less digits than its factorization.

90099918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668528 (or 1668522 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 90099918 is about 9492.0976606860. The cubic root of 90099918 is about 448.3062551727.

The spelling of 90099918 in words is "ninety million, ninety-nine thousand, nine hundred eighteen".