128560287 has 4 divisors (see below), whose sum is σ = 171413720. Its totient is φ = 85706856.

The previous prime is 128560217. The next prime is 128560291. The reversal of 128560287 is 782065821.

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

It is not a de Polignac number, because 128560287 - 2¹² = 128556191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128560207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21426712 + ... + 21426717.

It is an arithmetic number, because the mean of its divisors is an integer number (42853430).

Almost surely, 2^128560287 is an apocalyptic number.

128560287 is a deficient number, since it is larger than the sum of its proper divisors (42853433).

128560287 is an equidigital number, since it uses as much as digits as its factorization.

128560287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42853432.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 128560287 is about 11338.4428825126. The cubic root of 128560287 is about 504.7026802624.

The spelling of 128560287 in words is "one hundred twenty-eight million, five hundred sixty thousand, two hundred eighty-seven".