129273128 has 16 divisors (see below), whose sum is σ = 244612500. Its totient is φ = 64043136.

The previous prime is 129273127. The next prime is 129273139. The reversal of 129273128 is 821372921.

It can be written as a sum of positive squares in 2 ways, for example, as 129095044 + 178084 = 11362^2 + 422^2 .

It is not an unprimeable number, because it can be changed into a prime (129273121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73253 + ... + 74996.

Almost surely, 2^129273128 is an apocalyptic number.

It is an amenable number.

129273128 is a deficient number, since it is larger than the sum of its proper divisors (115339372).

129273128 is a wasteful number, since it uses less digits than its factorization.

129273128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148364 (or 148360 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 129273128 is about 11369.8341236801. The cubic root of 129273128 is about 505.6337864813.

The spelling of 129273128 in words is "one hundred twenty-nine million, two hundred seventy-three thousand, one hundred twenty-eight".