9909990870 has 64 divisors (see below), whose sum is σ = 25770818304. Its totient is φ = 2424401280.

The previous prime is 9909990869. The next prime is 9909990889. The reversal of 9909990870 is 780999099.

It is a congruent number.

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, 14376 + ... + 141515.

It is an arithmetic number, because the mean of its divisors is an integer number (402669036).

Almost surely, 2^9909990870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9909990870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12885409152).

9909990870 is an abundant number, since it is smaller than the sum of its proper divisors (15860827434).

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

9909990870 is a wasteful number, since it uses less digits than its factorization.

9909990870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156077.

The product of its (nonzero) digits is 3306744, while the sum is 60.

The square root of 9909990870 is about 99548.9370611259. The cubic root of 9909990870 is about 2147.9512388842.

The spelling of 9909990870 in words is "nine billion, nine hundred nine million, nine hundred ninety thousand, eight hundred seventy".