9989643264 has 88 divisors (see below), whose sum is σ = 26875767168. Its totient is φ = 3298652160.

The previous prime is 9989643263. The next prime is 9989643397. The reversal of 9989643264 is 4623469899.

It is a junction number, because it is equal to n+sod(n) for n = 9989643198 and 9989643207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9989643263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313509 + ... + 343899.

Almost surely, 2^9989643264 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 9989643264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13437883584).

9989643264 is an abundant number, since it is smaller than the sum of its proper divisors (16886123904).

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

9989643264 is a wasteful number, since it uses less digits than its factorization.

9989643264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30521 (or 30503 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 60.

The square root of 9989643264 is about 99948.2029053049. The cubic root of 9989643264 is about 2153.6906694081.

The spelling of 9989643264 in words is "nine billion, nine hundred eighty-nine million, six hundred forty-three thousand, two hundred sixty-four".