28228718281 has 2 divisors, whose sum is σ = 28228718282. Its totient is φ = 28228718280.

The previous prime is 28228718267. The next prime is 28228718299. The reversal of 28228718281 is 18281782282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23032615225 + 5196103056 = 151765^2 + 72084^2 .

It is a cyclic number.

It is not a de Polignac number, because 28228718281 - 2⁷ = 28228718153 is a prime.

It is a super-2 number, since 2×28228718281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28228718261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14114359140 + 14114359141.

It is an arithmetic number, because the mean of its divisors is an integer number (14114359141).

Almost surely, 2^28228718281 is an apocalyptic number.

It is an amenable number.

28228718281 is a deficient number, since it is larger than the sum of its proper divisors (1).

28228718281 is an equidigital number, since it uses as much as digits as its factorization.

28228718281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 458752, while the sum is 49.

The spelling of 28228718281 in words is "twenty-eight billion, two hundred twenty-eight million, seven hundred eighteen thousand, two hundred eighty-one".