265128765 has 16 divisors (see below), whose sum is σ = 462770496. Its totient is φ = 128547200.

The previous prime is 265128763. The next prime is 265128767. The reversal of 265128765 is 567821562.

It is an interprime number because it is at equal distance from previous prime (265128763) and next prime (265128767).

It is not a de Polignac number, because 265128765 - 2¹ = 265128763 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265128763) 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, 803256 + ... + 803585.

It is an arithmetic number, because the mean of its divisors is an integer number (28923156).

Almost surely, 2^265128765 is an apocalyptic number.

It is an amenable number.

265128765 is a deficient number, since it is larger than the sum of its proper divisors (197641731).

265128765 is a wasteful number, since it uses less digits than its factorization.

265128765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606860.

The product of its digits is 201600, while the sum is 42.

The square root of 265128765 is about 16282.7751013149. The cubic root of 265128765 is about 642.4198469761.

The spelling of 265128765 in words is "two hundred sixty-five million, one hundred twenty-eight thousand, seven hundred sixty-five".