99859998 has 32 divisors (see below), whose sum is σ = 228685824. Its totient is φ = 28477152.

The previous prime is 99859979. The next prime is 99859999. The reversal of 99859998 is 89995899.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99859999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23536 + ... + 27452.

It is an arithmetic number, because the mean of its divisors is an integer number (7146432).

Almost surely, 2^99859998 is an apocalyptic number.

99859998 is an abundant number, since it is smaller than the sum of its proper divisors (128825826).

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

99859998 is a wasteful number, since it uses less digits than its factorization.

99859998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536.

The product of its digits is 18895680, while the sum is 66.

The square root of 99859998 is about 9992.9974482134. The cubic root of 99859998 is about 463.9421716229.

The spelling of 99859998 in words is "ninety-nine million, eight hundred fifty-nine thousand, nine hundred ninety-eight".