128357569 has 4 divisors (see below), whose sum is σ = 128402820. Its totient is φ = 128312320.

The previous prime is 128357561. The next prime is 128357609. The reversal of 128357569 is 965753821.

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 116899344 + 11458225 = 10812^2 + 3385^2 .

It is a cyclic number.

It is not a de Polignac number, because 128357569 - 2³ = 128357561 is a prime.

It is a super-2 number, since 2×128357569² = 32951331039179522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128357561) 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, 18064 + ... + 24145.

It is an arithmetic number, because the mean of its divisors is an integer number (32100705).

Almost surely, 2^128357569 is an apocalyptic number.

It is an amenable number.

128357569 is a deficient number, since it is larger than the sum of its proper divisors (45251).

128357569 is an equidigital number, since it uses as much as digits as its factorization.

128357569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45250.

The product of its digits is 453600, while the sum is 46.

The square root of 128357569 is about 11329.4999448343. The cubic root of 128357569 is about 504.4372635620.

The spelling of 128357569 in words is "one hundred twenty-eight million, three hundred fifty-seven thousand, five hundred sixty-nine".