9990888999 has 32 divisors (see below), whose sum is σ = 16838438400. Its totient is φ = 5127484032.

The previous prime is 9990888913. The next prime is 9990889009. The reversal of 9990888999 is 9998880999.

It is not a de Polignac number, because 9990888999 - 2¹¹ = 9990886951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990883999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 484449 + ... + 504650.

It is an arithmetic number, because the mean of its divisors is an integer number (526201200).

Almost surely, 2^9990888999 is an apocalyptic number.

9990888999 is a deficient number, since it is larger than the sum of its proper divisors (6847549401).

9990888999 is a wasteful number, since it uses less digits than its factorization.

9990888999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989159.

The product of its (nonzero) digits is 272097792, while the sum is 78.

The square root of 9990888999 is about 99954.4346139780. The cubic root of 9990888999 is about 2153.7801893326.

The spelling of 9990888999 in words is "nine billion, nine hundred ninety million, eight hundred eighty-eight thousand, nine hundred ninety-nine".