28017695565 has 24 divisors (see below), whose sum is σ = 48685144248. Its totient is φ = 14905497600.

The previous prime is 28017695549. The next prime is 28017695567. The reversal of 28017695565 is 56559671082.

28017695565 is a `hidden beast` number, since 2 + 8 + 0 + 1 + 76 + 9 + 5 + 565 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14323781124 + 13693914441 = 119682^2 + 117021^2 .

It is not a de Polignac number, because 28017695565 - 2⁴ = 28017695549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28017695567) 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 23 ways as a sum of consecutive naturals, for example, 758284 + ... + 794373.

It is an arithmetic number, because the mean of its divisors is an integer number (2028547677).

Almost surely, 2^28017695565 is an apocalyptic number.

It is an amenable number.

28017695565 is a deficient number, since it is larger than the sum of its proper divisors (20667448683).

28017695565 is a wasteful number, since it uses less digits than its factorization.

28017695565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553069 (or 1553066 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 54.

The spelling of 28017695565 in words is "twenty-eight billion, seventeen million, six hundred ninety-five thousand, five hundred sixty-five".