128323585 has 32 divisors (see below), whose sum is σ = 171793440. Its totient is φ = 91404288.

The previous prime is 128323553. The next prime is 128323597. The reversal of 128323585 is 585323821.

It is a Cunningham number, because it is equal to 11328²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 13490929 + 114832656 = 3673^2 + 10716^2 .

It is a cyclic number.

It is not a de Polignac number, because 128323585 - 2⁵ = 128323553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 550629 + ... + 550861.

It is an arithmetic number, because the mean of its divisors is an integer number (5368545).

Almost surely, 2^128323585 is an apocalyptic number.

It is an amenable number.

128323585 is a deficient number, since it is larger than the sum of its proper divisors (43469855).

128323585 is a wasteful number, since it uses less digits than its factorization.

128323585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517.

The product of its digits is 57600, while the sum is 37.

The square root of 128323585 is about 11328.0000441384. Note that the first 4 decimals coincide. The cubic root of 128323585 is about 504.3927412970.

The spelling of 128323585 in words is "one hundred twenty-eight million, three hundred twenty-three thousand, five hundred eighty-five".