9988878643 has 4 divisors (see below), whose sum is σ = 10006434360. Its totient is φ = 9971322928.

The previous prime is 9988878637. The next prime is 9988878671. The reversal of 9988878643 is 3468788899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3468788899 = 137 ⋅25319627.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9988878643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9988878673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8777005 + ... + 8778142.

It is an arithmetic number, because the mean of its divisors is an integer number (2501608590).

Almost surely, 2^9988878643 is an apocalyptic number.

9988878643 is a deficient number, since it is larger than the sum of its proper divisors (17555717).

9988878643 is a wasteful number, since it uses less digits than its factorization.

9988878643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17555716.

The product of its digits is 167215104, while the sum is 70.

The square root of 9988878643 is about 99944.3777458242. The cubic root of 9988878643 is about 2153.6357191933.

The spelling of 9988878643 in words is "nine billion, nine hundred eighty-eight million, eight hundred seventy-eight thousand, six hundred forty-three".