28208218889 has 2 divisors, whose sum is σ = 28208218890. Its totient is φ = 28208218888.

The previous prime is 28208218811. The next prime is 28208218901. The reversal of 28208218889 is 98881280282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28117588489 + 90630400 = 167683^2 + 9520^2 .

It is a cyclic number.

It is not a de Polignac number, because 28208218889 - 2¹⁶ = 28208153353 is a prime.

It is a super-2 number, since 2×28208218889² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28208212889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14104109444 + 14104109445.

It is an arithmetic number, because the mean of its divisors is an integer number (14104109445).

Almost surely, 2^28208218889 is an apocalyptic number.

It is an amenable number.

28208218889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28208218889 is an equidigital number, since it uses as much as digits as its factorization.

28208218889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2359296, while the sum is 56.

The spelling of 28208218889 in words is "twenty-eight billion, two hundred eight million, two hundred eighteen thousand, eight hundred eighty-nine".