28220745847 has 16 divisors (see below), whose sum is σ = 34672112640. Its totient is φ = 22428512928.

The previous prime is 28220745829. The next prime is 28220745913. The reversal of 28220745847 is 74854702282.

It is a cyclic number.

It is not a de Polignac number, because 28220745847 - 2⁷ = 28220745719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28220745847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28220745947) 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 15 ways as a sum of consecutive naturals, for example, 2251048 + ... + 2263549.

It is an arithmetic number, because the mean of its divisors is an integer number (2167007040).

Almost surely, 2^28220745847 is an apocalyptic number.

28220745847 is a deficient number, since it is larger than the sum of its proper divisors (6451366793).

28220745847 is a wasteful number, since it uses less digits than its factorization.

28220745847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4514670.

The product of its (nonzero) digits is 2007040, while the sum is 49.

The spelling of 28220745847 in words is "twenty-eight billion, two hundred twenty million, seven hundred forty-five thousand, eight hundred forty-seven".