128788265 has 4 divisors (see below), whose sum is σ = 154545924. Its totient is φ = 103030608.

The previous prime is 128788241. The next prime is 128788273. The reversal of 128788265 is 562887821.

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 44368921 + 84419344 = 6661^2 + 9188^2 .

It is a cyclic number.

It is not a de Polignac number, because 128788265 - 2¹² = 128784169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12878822 + ... + 12878831.

It is an arithmetic number, because the mean of its divisors is an integer number (38636481).

Almost surely, 2^128788265 is an apocalyptic number.

It is an amenable number.

128788265 is a deficient number, since it is larger than the sum of its proper divisors (25757659).

128788265 is an equidigital number, since it uses as much as digits as its factorization.

128788265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25757658.

The product of its digits is 430080, while the sum is 47.

The square root of 128788265 is about 11348.4917500080. The cubic root of 128788265 is about 505.0008365179. Note that the first 3 decimals are identical.

The spelling of 128788265 in words is "one hundred twenty-eight million, seven hundred eighty-eight thousand, two hundred sixty-five".