128536585 has 4 divisors (see below), whose sum is σ = 154243908. Its totient is φ = 102829264.

The previous prime is 128536553. The next prime is 128536621. The reversal of 128536585 is 585635821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 585635821 = 23 ⋅25462427.

It can be written as a sum of positive squares in 2 ways, for example, as 20043529 + 108493056 = 4477^2 + 10416^2 .

It is a cyclic number.

It is not a de Polignac number, because 128536585 - 2⁵ = 128536553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12853654 + ... + 12853663.

It is an arithmetic number, because the mean of its divisors is an integer number (38560977).

Almost surely, 2^128536585 is an apocalyptic number.

It is an amenable number.

128536585 is a deficient number, since it is larger than the sum of its proper divisors (25707323).

128536585 is an equidigital number, since it uses as much as digits as its factorization.

128536585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25707322.

The product of its digits is 288000, while the sum is 43.

The square root of 128536585 is about 11337.3976290858. The cubic root of 128536585 is about 504.6716618755.

The spelling of 128536585 in words is "one hundred twenty-eight million, five hundred thirty-six thousand, five hundred eighty-five".