9999000870 has 64 divisors (see below), whose sum is σ = 24879343104. Its totient is φ = 2569998080.

The previous prime is 9999000859. The next prime is 9999000901. The reversal of 9999000870 is 780009999.

It is a Curzon number.

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, 53119 + ... + 151061.

It is an arithmetic number, because the mean of its divisors is an integer number (388739736).

Almost surely, 2^9999000870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999000870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12439671552).

9999000870 is an abundant number, since it is smaller than the sum of its proper divisors (14880342234).

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

9999000870 is a wasteful number, since it uses less digits than its factorization.

9999000870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98077.

The product of its (nonzero) digits is 367416, while the sum is 51.

The square root of 9999000870 is about 99995.0042252112. The cubic root of 9999000870 is about 2154.3629356310.

The spelling of 9999000870 in words is "nine billion, nine hundred ninety-nine million, eight hundred seventy", and thus it is an aban number.