28043280685269 has 12 divisors (see below), whose sum is σ = 40507500559500. Its totient is φ = 18695271424704.

The previous prime is 28043280685237. The next prime is 28043280685363. The reversal of 28043280685269 is 96258608234082.

28043280685269 is a `hidden beast` number, since 2 + 8 + 0 + 43 + 2 + 8 + 0 + 68 + 526 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24474411854244 + 3568868831025 = 4947162^2 + 1889145^2 .

It is not a de Polignac number, because 28043280685269 - 2⁵ = 28043280685237 is a prime.

It is a super-4 number, since 4×28043280685269⁴ (a number of 55 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28043280685169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20038194 + ... + 21391955.

It is an arithmetic number, because the mean of its divisors is an integer number (3375625046625).

Almost surely, 2^{28043280685269} is an apocalyptic number.

It is an amenable number.

28043280685269 is a deficient number, since it is larger than the sum of its proper divisors (12464219874231).

28043280685269 is a wasteful number, since it uses less digits than its factorization.

28043280685269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41505364 (or 41505361 counting only the distinct ones).

The product of its (nonzero) digits is 79626240, while the sum is 63.

The spelling of 28043280685269 in words is "twenty-eight trillion, forty-three billion, two hundred eighty million, six hundred eighty-five thousand, two hundred sixty-nine".