129328 has 20 divisors (see below), whose sum is σ = 256680. Its totient is φ = 63104.

The previous prime is 129313. The next prime is 129341. The reversal of 129328 is 823921.

It is an Ulam number.

It is an unprimeable number.

129328 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876 + ... + 1012.

It is an arithmetic number, because the mean of its divisors is an integer number (12834).

2¹²⁹³²⁸ is an apocalyptic number.

It is an amenable number.

129328 is a deficient number, since it is larger than the sum of its proper divisors (127352).

129328 is a wasteful number, since it uses less digits than its factorization.

129328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 198 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 129328 is about 359.6220237972. The cubic root of 129328 is about 50.5705317750.

The spelling of 129328 in words is "one hundred twenty-nine thousand, three hundred twenty-eight".