129301028 has 6 divisors (see below), whose sum is σ = 226276806. Its totient is φ = 64650512.

The previous prime is 129301021. The next prime is 129301033. The reversal of 129301028 is 820103921.

It can be written as a sum of positive squares in only one way, i.e., 74511424 + 54789604 = 8632^2 + 7402^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129300988 and 129301006.

It is not an unprimeable number, because it can be changed into a prime (129301021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16162625 + ... + 16162632.

It is an arithmetic number, because the mean of its divisors is an integer number (37712801).

Almost surely, 2^129301028 is an apocalyptic number.

It is an amenable number.

129301028 is a deficient number, since it is larger than the sum of its proper divisors (96975778).

129301028 is a wasteful number, since it uses less digits than its factorization.

129301028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32325261 (or 32325259 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 129301028 is about 11371.0609883159. The cubic root of 129301028 is about 505.6701595159.

Adding to 129301028 its reverse (820103921), we get a palindrome (949404949).

The spelling of 129301028 in words is "one hundred twenty-nine million, three hundred one thousand, twenty-eight".