9899571720 has 64 divisors (see below), whose sum is σ = 29719872000. Its totient is φ = 2638005248.

The previous prime is 9899571637. The next prime is 9899571739. The reversal of 9899571720 is 271759989.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144016 + ... + 201344.

It is an arithmetic number, because the mean of its divisors is an integer number (464373000).

Almost surely, 2^9899571720 is an apocalyptic number.

It is an amenable number.

9899571720 is an abundant number, since it is smaller than the sum of its proper divisors (19820300280).

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

9899571720 is a wasteful number, since it uses less digits than its factorization.

9899571720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58782 (or 58778 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 57.

The square root of 9899571720 is about 99496.5914994077. The cubic root of 9899571720 is about 2147.1982050940.

The spelling of 9899571720 in words is "nine billion, eight hundred ninety-nine million, five hundred seventy-one thousand, seven hundred twenty".