9899638272 has 240 divisors, whose sum is σ = 29782312560. Its totient is φ = 3162931200.

The previous prime is 9899638249. The next prime is 9899638277. The reversal of 9899638272 is 2728369989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9899638277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11524179 + ... + 11525037.

It is an arithmetic number, because the mean of its divisors is an integer number (124092969).

Almost surely, 2^9899638272 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 9899638272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14891156280).

9899638272 is an abundant number, since it is smaller than the sum of its proper divisors (19882674288).

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

9899638272 is a wasteful number, since it uses less digits than its factorization.

9899638272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985 (or 966 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The square root of 9899638272 is about 99496.9259424632. The cubic root of 9899638272 is about 2147.2030167505.

The spelling of 9899638272 in words is "nine billion, eight hundred ninety-nine million, six hundred thirty-eight thousand, two hundred seventy-two".