128668 has 12 divisors (see below), whose sum is σ = 237160. Its totient is φ = 60912.

The previous prime is 128663. The next prime is 128669. The reversal of 128668 is 866821.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128663) 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, 771 + ... + 922.

2¹²⁸⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

128668 is a deficient number, since it is larger than the sum of its proper divisors (108492).

128668 is a wasteful number, since it uses less digits than its factorization.

128668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716 (or 1714 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 128668 is about 358.7032199465. The cubic root of 128668 is about 50.4843594344.

The spelling of 128668 in words is "one hundred twenty-eight thousand, six hundred sixty-eight".