9900990120 has 128 divisors (see below), whose sum is σ = 34327929600. Its totient is φ = 2237638656.

The previous prime is 9900990109. The next prime is 9900990139. The reversal of 9900990120 is 210990099.

It is a happy number.

It is a super-2 number, since 2×9900990120² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8542 + ... + 140978.

It is an arithmetic number, because the mean of its divisors is an integer number (268186950).

Almost surely, 2^9900990120 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 9900990120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17163964800).

9900990120 is an abundant number, since it is smaller than the sum of its proper divisors (24426939480).

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

9900990120 is a wasteful number, since it uses less digits than its factorization.

9900990120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132547 (or 132543 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 9900990120 is about 99503.7191264729. The cubic root of 9900990120 is about 2147.3007496140.

The spelling of 9900990120 in words is "nine billion, nine hundred million, nine hundred ninety thousand, one hundred twenty".