99128 has 8 divisors (see below), whose sum is σ = 185880. Its totient is φ = 49560.

The previous prime is 99119. The next prime is 99131. The reversal of 99128 is 82199.

It is a tau number, because it is divible by the number of its divisors (8).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 99128.

It is a congruent number.

It is an unprimeable 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 as a sum of consecutive naturals, namely, 6188 + ... + 6203.

It is an arithmetic number, because the mean of its divisors is an integer number (23235).

2⁹⁹¹²⁸ is an apocalyptic number.

It is an amenable number.

99128 is a deficient number, since it is larger than the sum of its proper divisors (86752).

99128 is a wasteful number, since it uses less digits than its factorization.

99128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12397 (or 12393 counting only the distinct ones).

The product of its digits is 1296, while the sum is 29.

The square root of 99128 is about 314.8459940987. The cubic root of 99128 is about 46.2805787554.

Subtracting from 99128 its sum of digits (29), we obtain a palindrome (99099).

The spelling of 99128 in words is "ninety-nine thousand, one hundred twenty-eight".