99688831872 has 128 divisors (see below), whose sum is σ = 309066071040. Its totient is φ = 27876476928.

The previous prime is 99688831849. The next prime is 99688831889. The reversal of 99688831872 is 27813888699.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 99688831797 and 99688831806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268203 + ... + 520874.

It is an arithmetic number, because the mean of its divisors is an integer number (2414578680).

Almost surely, 2^99688831872 is an apocalyptic number.

It is an amenable number.

99688831872 is an abundant number, since it is smaller than the sum of its proper divisors (209377239168).

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

99688831872 is a wasteful number, since it uses less digits than its factorization.

99688831872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789148 (or 789136 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 69.

The spelling of 99688831872 in words is "ninety-nine billion, six hundred eighty-eight million, eight hundred thirty-one thousand, eight hundred seventy-two".