128860265 has 4 divisors (see below), whose sum is σ = 154632324. Its totient is φ = 103088208.

The previous prime is 128860247. The next prime is 128860267. The reversal of 128860265 is 562068821.

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 34070569 + 94789696 = 5837^2 + 9736^2 .

It is a cyclic number.

It is not a de Polignac number, because 128860265 - 2⁸ = 128860009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128860267) 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, 12886022 + ... + 12886031.

It is an arithmetic number, because the mean of its divisors is an integer number (38658081).

Almost surely, 2^128860265 is an apocalyptic number.

It is an amenable number.

128860265 is a deficient number, since it is larger than the sum of its proper divisors (25772059).

128860265 is an equidigital number, since it uses as much as digits as its factorization.

128860265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25772058.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 128860265 is about 11351.6635344781. The cubic root of 128860265 is about 505.0949270951.

The spelling of 128860265 in words is "one hundred twenty-eight million, eight hundred sixty thousand, two hundred sixty-five".