99859988 has 12 divisors (see below), whose sum is σ = 175802592. Its totient is φ = 49630680.

The previous prime is 99859979. The next prime is 99859999. The reversal of 99859988 is 88995899.

It is a congruent number.

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, 74078 + ... + 75413.

It is an arithmetic number, because the mean of its divisors is an integer number (14650216).

Almost surely, 2^99859988 is an apocalyptic number.

It is an amenable number.

99859988 is a deficient number, since it is larger than the sum of its proper divisors (75942604).

99859988 is a wasteful number, since it uses less digits than its factorization.

99859988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149662 (or 149660 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 65.

The square root of 99859988 is about 9992.9969478630. The cubic root of 99859988 is about 463.9421561365.

The spelling of 99859988 in words is "ninety-nine million, eight hundred fifty-nine thousand, nine hundred eighty-eight".