9999988884 has 36 divisors (see below), whose sum is σ = 25692144660. Its totient is φ = 3278684160.

The previous prime is 9999988871. The next prime is 9999988903. The reversal of 9999988884 is 4888899999.

It can be written as a sum of positive squares in 2 ways, for example, as 827712900 + 9172275984 = 28770^2 + 95772^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2274669 + ... + 2279060.

It is an arithmetic number, because the mean of its divisors is an integer number (713670685).

Almost surely, 2^9999988884 is an apocalyptic number.

It is an amenable number.

9999988884 is an abundant number, since it is smaller than the sum of its proper divisors (15692155776).

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

9999988884 is a wasteful number, since it uses less digits than its factorization.

9999988884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553800 (or 4553795 counting only the distinct ones).

The product of its digits is 967458816, while the sum is 81.

The square root of 9999988884 is about 99999.9444199846. The cubic root of 9999988884 is about 2154.4338917417.

The spelling of 9999988884 in words is "nine billion, nine hundred ninety-nine million, nine hundred eighty-eight thousand, eight hundred eighty-four".