128868 has 12 divisors (see below), whose sum is σ = 300720. Its totient is φ = 42952.

The previous prime is 128861. The next prime is 128873. The reversal of 128868 is 868821.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×128868² = 33213922848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5358 + ... + 5381.

It is an arithmetic number, because the mean of its divisors is an integer number (25060).

2¹²⁸⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

128868 is an abundant number, since it is smaller than the sum of its proper divisors (171852).

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

128868 is a wasteful number, since it uses less digits than its factorization.

128868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10746 (or 10744 counting only the distinct ones).

The product of its digits is 6144, while the sum is 33.

The square root of 128868 is about 358.9818936938. The cubic root of 128868 is about 50.5105033213.

The spelling of 128868 in words is "one hundred twenty-eight thousand, eight hundred sixty-eight".