99988 has 12 divisors (see below), whose sum is σ = 200032. Its totient is φ = 42840.

The previous prime is 99971. The next prime is 99989. The reversal of 99988 is 88999.

99988 is an admirable number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99989) by changing a digit.

99988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1758 + ... + 1813.

2⁹⁹⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

99988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100016).

99988 is a wasteful number, since it uses less digits than its factorization.

99988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3582 (or 3580 counting only the distinct ones).

The product of its digits is 46656, while the sum is 43.

The square root of 99988 is about 316.2087917816. The cubic root of 99988 is about 46.4140316263.

The spelling of 99988 in words is "ninety-nine thousand, nine hundred eighty-eight".