9998967888 has 480 divisors, whose sum is σ = 36397670400. Its totient is φ = 2586981888.

The previous prime is 9998967887. The next prime is 9998967929. The reversal of 9998967888 is 8887698999.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998967887) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20874433 + ... + 20874911.

It is an arithmetic number, because the mean of its divisors is an integer number (75828480).

Almost surely, 2^9998967888 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 9998967888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18198835200).

9998967888 is an abundant number, since it is smaller than the sum of its proper divisors (26398702512).

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

9998967888 is a wasteful number, since it uses less digits than its factorization.

9998967888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 563 counting only the distinct ones).

The product of its digits is 1128701952, while the sum is 81.

The square root of 9998967888 is about 99994.8393068362. The cubic root of 9998967888 is about 2154.3605668852.

The spelling of 9998967888 in words is "nine billion, nine hundred ninety-eight million, nine hundred sixty-seven thousand, eight hundred eighty-eight".