9909212868 has 192 divisors, whose sum is σ = 27456307200. Its totient is φ = 3085050240.

The previous prime is 9909212867. The next prime is 9909212891. The reversal of 9909212868 is 8682129099.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (9909212867) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20687053 + ... + 20687531.

It is an arithmetic number, because the mean of its divisors is an integer number (143001600).

Almost surely, 2^9909212868 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 9909212868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13728153600).

9909212868 is an abundant number, since it is smaller than the sum of its proper divisors (17547094332).

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

9909212868 is a wasteful number, since it uses less digits than its factorization.

9909212868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 9909212868 is about 99545.0293485315. The cubic root of 9909212868 is about 2147.8950277967.

The spelling of 9909212868 in words is "nine billion, nine hundred nine million, two hundred twelve thousand, eight hundred sixty-eight".