128287569 has 4 divisors (see below), whose sum is σ = 171050096. Its totient is φ = 85525044.

The previous prime is 128287553. The next prime is 128287591. The reversal of 128287569 is 965782821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 128287569 - 2⁴ = 128287553 is a prime.

It is a super-3 number, since 3×128287569³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128287529) 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, 21381259 + ... + 21381264.

It is an arithmetic number, because the mean of its divisors is an integer number (42762524).

Almost surely, 2^128287569 is an apocalyptic number.

It is an amenable number.

128287569 is a deficient number, since it is larger than the sum of its proper divisors (42762527).

128287569 is an equidigital number, since it uses as much as digits as its factorization.

128287569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42762526.

The product of its digits is 483840, while the sum is 48.

The square root of 128287569 is about 11326.4102433207. The cubic root of 128287569 is about 504.3455483387.

The spelling of 128287569 in words is "one hundred twenty-eight million, two hundred eighty-seven thousand, five hundred sixty-nine".