99999888890 has 32 divisors (see below), whose sum is σ = 196376457024. Its totient is φ = 36361181440.

The previous prime is 99999888719. The next prime is 99999888929. The reversal of 99999888890 is 9888899999.

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, 3154097 + ... + 3185643.

It is an arithmetic number, because the mean of its divisors is an integer number (6136764282).

Almost surely, 2^99999888890 is an apocalyptic number.

99999888890 is a deficient number, since it is larger than the sum of its proper divisors (96376568134).

99999888890 is a wasteful number, since it uses less digits than its factorization.

99999888890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60382.

The product of its (nonzero) digits is 2176782336, while the sum is 86.

It can be divided in two parts, 99999 and 888890, that added together give a palindrome (988889).

The spelling of 99999888890 in words is "ninety-nine billion, nine hundred ninety-nine million, eight hundred eighty-eight thousand, eight hundred ninety".