28663384717 has 12 divisors (see below), whose sum is σ = 31606734460. Its totient is φ = 25974336960.

The previous prime is 28663384693. The next prime is 28663384721. The reversal of 28663384717 is 71748336682.

It can be written as a sum of positive squares in 2 ways, for example, as 6826229641 + 21837155076 = 82621^2 + 147774^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28663384717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28663384727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 340542 + ... + 416287.

Almost surely, 2^28663384717 is an apocalyptic number.

It is an amenable number.

28663384717 is a deficient number, since it is larger than the sum of its proper divisors (2943349743).

28663384717 is a wasteful number, since it uses less digits than its factorization.

28663384717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757164 (or 757153 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 55.

The spelling of 28663384717 in words is "twenty-eight billion, six hundred sixty-three million, three hundred eighty-four thousand, seven hundred seventeen".