128595609 has 12 divisors (see below), whose sum is σ = 190769956. Its totient is φ = 83413152.

The previous prime is 128595587. The next prime is 128595617. The reversal of 128595609 is 906595821.

128595609 is a `hidden beast` number, since 1 + 2 + 85 + 9 + 560 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 115089984 + 13505625 = 10728^2 + 3675^2 .

It is not a de Polignac number, because 128595609 - 2⁸ = 128595353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128595679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192754 + ... + 193419.

Almost surely, 2^128595609 is an apocalyptic number.

It is an amenable number.

128595609 is a deficient number, since it is larger than the sum of its proper divisors (62174347).

128595609 is a wasteful number, since it uses less digits than its factorization.

128595609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386216 (or 386213 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 128595609 is about 11340.0003968254. Note that the first 3 decimals coincide. The cubic root of 128595609 is about 504.7488984637.

The spelling of 128595609 in words is "one hundred twenty-eight million, five hundred ninety-five thousand, six hundred nine".