28555681717 has 16 divisors (see below), whose sum is σ = 30015111168. Its totient is φ = 27115007920.

The previous prime is 28555681667. The next prime is 28555681741. The reversal of 28555681717 is 71718655582.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28555681717 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 (28555681747) 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 15 ways as a sum of consecutive naturals, for example, 2203218 + ... + 2216140.

It is an arithmetic number, because the mean of its divisors is an integer number (1875944448).

Almost surely, 2^28555681717 is an apocalyptic number.

It is an amenable number.

28555681717 is a deficient number, since it is larger than the sum of its proper divisors (1459429451).

28555681717 is a wasteful number, since it uses less digits than its factorization.

28555681717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13640.

The product of its digits is 4704000, while the sum is 55.

The spelling of 28555681717 in words is "twenty-eight billion, five hundred fifty-five million, six hundred eighty-one thousand, seven hundred seventeen".