28256814717 has 8 divisors (see below), whose sum is σ = 38314325280. Its totient is φ = 18518590320.

The previous prime is 28256814679. The next prime is 28256814737. The reversal of 28256814717 is 71741865282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28256814717 - 2⁶ = 28256814653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28256814717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28256814737) 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 7 ways as a sum of consecutive naturals, for example, 79821334 + ... + 79821687.

It is an arithmetic number, because the mean of its divisors is an integer number (4789290660).

Almost surely, 2^28256814717 is an apocalyptic number.

It is an amenable number.

28256814717 is a deficient number, since it is larger than the sum of its proper divisors (10057510563).

28256814717 is a wasteful number, since it uses less digits than its factorization.

28256814717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159643083.

The product of its digits is 1505280, while the sum is 51.

The spelling of 28256814717 in words is "twenty-eight billion, two hundred fifty-six million, eight hundred fourteen thousand, seven hundred seventeen".