90099099008 has 64 divisors (see below), whose sum is σ = 184591476720. Its totient is φ = 43773511680.

The previous prime is 90099098981. The next prime is 90099099037. The reversal of 90099099008 is 80099099009.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3648623 + ... + 3673233.

Almost surely, 2^90099099008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90099099008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92295738360).

90099099008 is an abundant number, since it is smaller than the sum of its proper divisors (94492377712).

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

90099099008 is a wasteful number, since it uses less digits than its factorization.

90099099008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25435 (or 25423 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 53.

Subtracting from 90099099008 its reverse (80099099009), we obtain a palindrome (9999999999).

The spelling of 90099099008 in words is "ninety billion, ninety-nine million, ninety-nine thousand, eight".