90409900 has 54 divisors (see below), whose sum is σ = 228232788. Its totient is φ = 30996000.

The previous prime is 90409897. The next prime is 90409901. The reversal of 90409900 is 990409.

It is not an unprimeable number, because it can be changed into a prime (90409901) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4326 + ... + 14125.

Almost surely, 2^90409900 is an apocalyptic number.

It is an amenable number.

90409900 is an abundant number, since it is smaller than the sum of its proper divisors (137822888).

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

90409900 is a wasteful number, since it uses less digits than its factorization.

90409900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18479 (or 18465 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 90409900 is about 9508.4120651137. The cubic root of 90409900 is about 448.8197880305.

The spelling of 90409900 in words is "ninety million, four hundred nine thousand, nine hundred".