28117365259 has 4 divisors (see below), whose sum is σ = 28513384560. Its totient is φ = 27721345960.

The previous prime is 28117365239. The next prime is 28117365293. The reversal of 28117365259 is 95256371182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28117365259 - 2⁹ = 28117364747 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28117365209) 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 3 ways as a sum of consecutive naturals, for example, 198009544 + ... + 198009685.

It is an arithmetic number, because the mean of its divisors is an integer number (7128346140).

Almost surely, 2^28117365259 is an apocalyptic number.

28117365259 is a deficient number, since it is larger than the sum of its proper divisors (396019301).

28117365259 is an equidigital number, since it uses as much as digits as its factorization.

28117365259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396019300.

The product of its digits is 907200, while the sum is 49.

The spelling of 28117365259 in words is "twenty-eight billion, one hundred seventeen million, three hundred sixty-five thousand, two hundred fifty-nine".