129028 has 6 divisors (see below), whose sum is σ = 225806. Its totient is φ = 64512.

The previous prime is 129023. The next prime is 129037. The reversal of 129028 is 820921.

It can be written as a sum of positive squares in only one way, i.e., 97344 + 31684 = 312^2 + 178^2 .

It is not an unprimeable number, because it can be changed into a prime (129023) by changing a digit.

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, 16125 + ... + 16132.

2¹²⁹⁰²⁸ is an apocalyptic number.

It is an amenable number.

129028 is a deficient number, since it is larger than the sum of its proper divisors (96778).

129028 is a wasteful number, since it uses less digits than its factorization.

129028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32261 (or 32259 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 129028 is about 359.2046770297. The cubic root of 129028 is about 50.5313989617.

Adding to 129028 its reverse (820921), we get a palindrome (949949).

The spelling of 129028 in words is "one hundred twenty-nine thousand, twenty-eight".