28312766393 has 2 divisors, whose sum is σ = 28312766394. Its totient is φ = 28312766392.

The previous prime is 28312766369. The next prime is 28312766429. The reversal of 28312766393 is 39366721382.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18726006649 + 9586759744 = 136843^2 + 97912^2 .

It is a cyclic number.

It is not a de Polignac number, because 28312766393 - 2¹⁸ = 28312504249 is a prime.

It is a super-2 number, since 2×28312766393² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28312736393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14156383196 + 14156383197.

It is an arithmetic number, because the mean of its divisors is an integer number (14156383197).

Almost surely, 2^28312766393 is an apocalyptic number.

It is an amenable number.

28312766393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28312766393 is an equidigital number, since it uses as much as digits as its factorization.

28312766393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 50.

The spelling of 28312766393 in words is "twenty-eight billion, three hundred twelve million, seven hundred sixty-six thousand, three hundred ninety-three".