9899981936 has 160 divisors (see below), whose sum is σ = 22138583040. Its totient is φ = 4256179200.

The previous prime is 9899981929. The next prime is 9899981957. The reversal of 9899981936 is 6391899989.

It is a self number, because there is not a number n which added to its sum of digits gives 9899981936.

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, 20162651 + ... + 20163141.

It is an arithmetic number, because the mean of its divisors is an integer number (138366144).

Almost surely, 2^9899981936 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 9899981936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11069291520).

9899981936 is an abundant number, since it is smaller than the sum of its proper divisors (12238601104).

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

9899981936 is a wasteful number, since it uses less digits than its factorization.

9899981936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 649 counting only the distinct ones).

The product of its digits is 68024448, while the sum is 71.

The square root of 9899981936 is about 99498.6529356051. The cubic root of 9899981936 is about 2147.2278630401.

The spelling of 9899981936 in words is "nine billion, eight hundred ninety-nine million, nine hundred eighty-one thousand, nine hundred thirty-six".