9939989268 has 72 divisors (see below), whose sum is σ = 27514783296. Its totient is φ = 3000633600.

The previous prime is 9939989239. The next prime is 9939989287. The reversal of 9939989268 is 8629899399.

9939989268 is a `hidden beast` number, since 99 + 399 + 8 + 92 + 68 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 9939989196 and 9939989205.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 56428 + ... + 151868.

It is an arithmetic number, because the mean of its divisors is an integer number (382149768).

Almost surely, 2^9939989268 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 9939989268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13757391648).

9939989268 is an abundant number, since it is smaller than the sum of its proper divisors (17574794028).

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

9939989268 is a wasteful number, since it uses less digits than its factorization.

9939989268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95725 (or 95720 counting only the distinct ones).

The product of its digits is 136048896, while the sum is 72.

The square root of 9939989268 is about 99699.4948231936. The cubic root of 9939989268 is about 2150.1164002601.

The spelling of 9939989268 in words is "nine billion, nine hundred thirty-nine million, nine hundred eighty-nine thousand, two hundred sixty-eight".