28218452849 has 2 divisors, whose sum is σ = 28218452850. Its totient is φ = 28218452848.

The previous prime is 28218452839. The next prime is 28218452879. The reversal of 28218452849 is 94825481282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15326440000 + 12892012849 = 123800^2 + 113543^2 .

It is a cyclic number.

It is not a de Polignac number, because 28218452849 - 2²⁴ = 28201675633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28218452849.

It is not a weakly prime, because it can be changed into another prime (28218452839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14109226424 + 14109226425.

It is an arithmetic number, because the mean of its divisors is an integer number (14109226425).

Almost surely, 2^28218452849 is an apocalyptic number.

It is an amenable number.

28218452849 is a deficient number, since it is larger than the sum of its proper divisors (1).

28218452849 is an equidigital number, since it uses as much as digits as its factorization.

28218452849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2949120, while the sum is 53.

The spelling of 28218452849 in words is "twenty-eight billion, two hundred eighteen million, four hundred fifty-two thousand, eight hundred forty-nine".