128585709 has 24 divisors (see below), whose sum is σ = 221500032. Its totient is φ = 70282080.

The previous prime is 128585683. The next prime is 128585713. The reversal of 128585709 is 907585821.

It is a happy number.

128585709 is a `hidden beast` number, since 1 + 28 + 58 + 570 + 9 = 666.

It is not a de Polignac number, because 128585709 - 2¹¹ = 128583661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128585759) 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 23 ways as a sum of consecutive naturals, for example, 42922 + ... + 45819.

It is an arithmetic number, because the mean of its divisors is an integer number (9229168).

Almost surely, 2^128585709 is an apocalyptic number.

It is an amenable number.

128585709 is a deficient number, since it is larger than the sum of its proper divisors (92914323).

128585709 is a wasteful number, since it uses less digits than its factorization.

128585709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88777 (or 88774 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 128585709 is about 11339.5638805026. The cubic root of 128585709 is about 504.7359453456.

The spelling of 128585709 in words is "one hundred twenty-eight million, five hundred eighty-five thousand, seven hundred nine".