129428585 has 16 divisors (see below), whose sum is σ = 182468160. Its totient is φ = 86888640.

The previous prime is 129428569. The next prime is 129428587. The reversal of 129428585 is 585824921.

It is not a de Polignac number, because 129428585 - 2⁴ = 129428569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129428587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89795 + ... + 91224.

It is an arithmetic number, because the mean of its divisors is an integer number (11404260).

Almost surely, 2^129428585 is an apocalyptic number.

It is an amenable number.

129428585 is a deficient number, since it is larger than the sum of its proper divisors (53039575).

129428585 is a wasteful number, since it uses less digits than its factorization.

129428585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181048.

The product of its digits is 230400, while the sum is 44.

The square root of 129428585 is about 11376.6684490672. The cubic root of 129428585 is about 505.8363880720.

The spelling of 129428585 in words is "one hundred twenty-nine million, four hundred twenty-eight thousand, five hundred eighty-five".