8999970720 has 192 divisors, whose sum is σ = 30918827520. Its totient is φ = 2187214848.

The previous prime is 8999970719. The next prime is 8999970769. The reversal of 8999970720 is 270799998.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 483832 + ... + 502088.

It is an arithmetic number, because the mean of its divisors is an integer number (161035560).

Almost surely, 2^8999970720 is an apocalyptic number.

8999970720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8999970720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15459413760).

8999970720 is an abundant number, since it is smaller than the sum of its proper divisors (21918856800).

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

8999970720 is a wasteful number, since it uses less digits than its factorization.

8999970720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18367 (or 18359 counting only the distinct ones).

The product of its (nonzero) digits is 5143824, while the sum is 60.

The square root of 8999970720 is about 94868.1754857761. The cubic root of 8999970720 is about 2080.0815673141.

The spelling of 8999970720 in words is "eight billion, nine hundred ninety-nine million, nine hundred seventy thousand, seven hundred twenty".