128254585 has 4 divisors (see below), whose sum is σ = 153905508. Its totient is φ = 102603664.

The previous prime is 128254583. The next prime is 128254591. The reversal of 128254585 is 585452821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47775744 + 80478841 = 6912^2 + 8971^2 .

It is a cyclic number.

It is not a de Polignac number, because 128254585 - 2¹ = 128254583 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128254583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12825454 + ... + 12825463.

It is an arithmetic number, because the mean of its divisors is an integer number (38476377).

Almost surely, 2^128254585 is an apocalyptic number.

It is an amenable number.

128254585 is a deficient number, since it is larger than the sum of its proper divisors (25650923).

128254585 is an equidigital number, since it uses as much as digits as its factorization.

128254585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25650922.

The product of its digits is 128000, while the sum is 40.

The square root of 128254585 is about 11324.9540837921. The cubic root of 128254585 is about 504.3023205612.

The spelling of 128254585 in words is "one hundred twenty-eight million, two hundred fifty-four thousand, five hundred eighty-five".