99999588 has 48 divisors (see below), whose sum is σ = 253169280. Its totient is φ = 30537984.

The previous prime is 99999587. The next prime is 99999589. The reversal of 99999588 is 88599999.

It is an interprime number because it is at equal distance from previous prime (99999587) and next prime (99999589).

It is not an unprimeable number, because it can be changed into a prime (99999587) 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, 19033 + ... + 23711.

It is an arithmetic number, because the mean of its divisors is an integer number (5274360).

Almost surely, 2^99999588 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99999588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126584640).

99999588 is an abundant number, since it is smaller than the sum of its proper divisors (153169692).

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

99999588 is a wasteful number, since it uses less digits than its factorization.

99999588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4836 (or 4834 counting only the distinct ones).

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

The square root of 99999588 is about 9999.9793999788. The cubic root of 99999588 is about 464.1582459155.

The spelling of 99999588 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred eighty-eight".