999999999988872 has 16 divisors (see below), whose sum is σ = 2499999999972240. Its totient is φ = 333333333329616.

The previous prime is 999999999988867. The next prime is 999999999988907. The reversal of 999999999988872 is 278889999999999.

It is a super-9 number, since 9×999999999988872⁹ (a number of 136 digits) contains 999999999 as substring.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20833333333078 + ... + 20833333333125.

It is an arithmetic number, because the mean of its divisors is an integer number (156249999998265).

Almost surely, 2^{999999999988872} is an apocalyptic number.

It is an amenable number.

999999999988872 is an abundant number, since it is smaller than the sum of its proper divisors (1499999999983368).

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

999999999988872 is a wasteful number, since it uses less digits than its factorization.

999999999988872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41666666666212 (or 41666666666208 counting only the distinct ones).

The product of its digits is 24993270586368, while the sum is 123.

The spelling of 999999999988872 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred eighty-eight thousand, eight hundred seventy-two".