265728261 has 16 divisors (see below), whose sum is σ = 368498240. Its totient is φ = 170190720.

The previous prime is 265728259. The next prime is 265728289. The reversal of 265728261 is 162827562.

It is not a de Polignac number, because 265728261 - 2¹ = 265728259 is a prime.

It is a super-2 number, since 2×265728261² = 141223017388168242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265728461) 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, 9016 + ... + 24753.

It is an arithmetic number, because the mean of its divisors is an integer number (23031140).

Almost surely, 2^265728261 is an apocalyptic number.

It is an amenable number.

265728261 is a deficient number, since it is larger than the sum of its proper divisors (102769979).

265728261 is a wasteful number, since it uses less digits than its factorization.

265728261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33876.

The product of its digits is 80640, while the sum is 39.

The square root of 265728261 is about 16301.1736080566. The cubic root of 265728261 is about 642.9036851030.

The spelling of 265728261 in words is "two hundred sixty-five million, seven hundred twenty-eight thousand, two hundred sixty-one".