9888888889 has 4 divisors (see below), whose sum is σ = 10787878800. Its totient is φ = 8989898980.

The previous prime is 9888888887. The next prime is 9888888931.

9888888889 is nontrivially palindromic in base 10.

9888888889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9888888889 - 2¹ = 9888888887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9888888881) 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 3 ways as a sum of consecutive naturals, for example, 449494939 + ... + 449494960.

It is an arithmetic number, because the mean of its divisors is an integer number (2696969700).

Almost surely, 2^9888888889 is an apocalyptic number.

It is an amenable number.

9888888889 is a deficient number, since it is larger than the sum of its proper divisors (898989911).

9888888889 is a wasteful number, since it uses less digits than its factorization.

9888888889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898989910.

The product of its digits is 1358954496, while the sum is 82.

The square root of 9888888889 is about 99442.8926017340. The cubic root of 9888888889 is about 2146.4255652210.

The spelling of 9888888889 in words is "nine billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-nine".