28281516293 has 2 divisors, whose sum is σ = 28281516294. Its totient is φ = 28281516292.

The previous prime is 28281516253. The next prime is 28281516301. The reversal of 28281516293 is 39261518282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27827911489 + 453604804 = 166817^2 + 21298^2 .

It is a cyclic number.

It is not a de Polignac number, because 28281516293 - 2²⁰ = 28280467717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28281516203) 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 as a sum of consecutive naturals, namely, 14140758146 + 14140758147.

It is an arithmetic number, because the mean of its divisors is an integer number (14140758147).

Almost surely, 2^28281516293 is an apocalyptic number.

It is an amenable number.

28281516293 is a deficient number, since it is larger than the sum of its proper divisors (1).

28281516293 is an equidigital number, since it uses as much as digits as its factorization.

28281516293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 47.

The spelling of 28281516293 in words is "twenty-eight billion, two hundred eighty-one million, five hundred sixteen thousand, two hundred ninety-three".