99999978884 has 48 divisors (see below), whose sum is σ = 193642533168. Its totient is φ = 44886140928.

The previous prime is 99999978863. The next prime is 99999978893. The reversal of 99999978884 is 48887999999.

It can be written as a sum of positive squares in 8 ways, for example, as 4661065984 + 95338912900 = 68272^2 + 308770^2 .

It is a super-3 number, since 3×99999978884³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99999978884.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4747544 + ... + 4768560.

It is an arithmetic number, because the mean of its divisors is an integer number (4034219441).

Almost surely, 2^99999978884 is an apocalyptic number.

It is an amenable number.

99999978884 is a deficient number, since it is larger than the sum of its proper divisors (93642554284).

99999978884 is a wasteful number, since it uses less digits than its factorization.

99999978884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23544 (or 23542 counting only the distinct ones).

The product of its digits is 7618738176, while the sum is 89.

The spelling of 99999978884 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred seventy-eight thousand, eight hundred eighty-four".