28285122317 has 12 divisors (see below), whose sum is σ = 29041341120. Its totient is φ = 27544110048.

The previous prime is 28285122289. The next prime is 28285122319. The reversal of 28285122317 is 71322158282.

It is a de Polignac number, because none of the positive numbers 2^k-28285122317 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 (28285122319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 387398 + ... + 454584.

It is an arithmetic number, because the mean of its divisors is an integer number (2420111760).

Almost surely, 2^28285122317 is an apocalyptic number.

It is an amenable number.

28285122317 is a deficient number, since it is larger than the sum of its proper divisors (756218803).

28285122317 is an frugal number, since it uses more digits than its factorization.

28285122317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67412 (or 67339 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The spelling of 28285122317 in words is "twenty-eight billion, two hundred eighty-five million, one hundred twenty-two thousand, three hundred seventeen".