9998788986 has 64 divisors (see below), whose sum is σ = 23629795200. Its totient is φ = 3123111168.

The previous prime is 9998788951. The next prime is 9998789027. The reversal of 9998788986 is 6898878999.

It is a happy 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, 186441 + ... + 234003.

It is an arithmetic number, because the mean of its divisors is an integer number (369215550).

Almost surely, 2^9998788986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9998788986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11814897600).

9998788986 is an abundant number, since it is smaller than the sum of its proper divisors (13631006214).

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

9998788986 is a wasteful number, since it uses less digits than its factorization.

9998788986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47820 (or 47814 counting only the distinct ones).

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

The square root of 9998788986 is about 99993.9447466695. The cubic root of 9998788986 is about 2154.3477181686.

The spelling of 9998788986 in words is "nine billion, nine hundred ninety-eight million, seven hundred eighty-eight thousand, nine hundred eighty-six".