9988888791 has 32 divisors (see below), whose sum is σ = 16036710400. Its totient is φ = 5402648160.

The previous prime is 9988888771. The next prime is 9988888801. The reversal of 9988888791 is 1978888899.

9988888791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9988888791 - 2¹⁴ = 9988872407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988888771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 456540 + ... + 477918.

It is an arithmetic number, because the mean of its divisors is an integer number (501147200).

Almost surely, 2^9988888791 is an apocalyptic number.

9988888791 is a deficient number, since it is larger than the sum of its proper divisors (6047821609).

9988888791 is a wasteful number, since it uses less digits than its factorization.

9988888791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22579.

The product of its digits is 167215104, while the sum is 75.

The square root of 9988888791 is about 99944.4285140497. The cubic root of 9988888791 is about 2153.6364485073.

The spelling of 9988888791 in words is "nine billion, nine hundred eighty-eight million, eight hundred eighty-eight thousand, seven hundred ninety-one".