28615802265 has 12 divisors (see below), whose sum is σ = 49600724004. Its totient is φ = 15261761184.

The previous prime is 28615802263. The next prime is 28615802297. The reversal of 28615802265 is 56220851682.

It is a happy number.

28615802265 is a `hidden beast` number, since 2 + 8 + 6 + 1 + 580 + 2 + 2 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12273759369 + 16342042896 = 110787^2 + 127836^2 .

It is not a de Polignac number, because 28615802265 - 2¹ = 28615802263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 635906717 = 28615802265 / (2 + 8 + 6 + 1 + 5 + 8 + 0 + 2 + 2 + 6 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28615802265.

It is not an unprimeable number, because it can be changed into a prime (28615802263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317953314 + ... + 317953403.

It is an arithmetic number, because the mean of its divisors is an integer number (4133393667).

Almost surely, 2^28615802265 is an apocalyptic number.

It is an amenable number.

28615802265 is a deficient number, since it is larger than the sum of its proper divisors (20984921739).

28615802265 is a wasteful number, since it uses less digits than its factorization.

28615802265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635906728 (or 635906725 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 28615802265 in words is "twenty-eight billion, six hundred fifteen million, eight hundred two thousand, two hundred sixty-five".