128272565 has 16 divisors (see below), whose sum is σ = 163393200. Its totient is φ = 96337920.

The previous prime is 128272523. The next prime is 128272567. The reversal of 128272565 is 565272821.

It can be written as a sum of positive squares in 8 ways, for example, as 8720209 + 119552356 = 2953^2 + 10934^2 .

It is not a de Polignac number, because 128272565 - 2¹⁰ = 128271541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128272567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36485 + ... + 39845.

It is an arithmetic number, because the mean of its divisors is an integer number (10212075).

Almost surely, 2^128272565 is an apocalyptic number.

It is an amenable number.

128272565 is a deficient number, since it is larger than the sum of its proper divisors (35120635).

128272565 is a wasteful number, since it uses less digits than its factorization.

128272565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3832.

The product of its digits is 67200, while the sum is 38.

The square root of 128272565 is about 11325.7478781756. The cubic root of 128272565 is about 504.3258854940.

The spelling of 128272565 in words is "one hundred twenty-eight million, two hundred seventy-two thousand, five hundred sixty-five".