28078765633 has 2 divisors, whose sum is σ = 28078765634. Its totient is φ = 28078765632.

The previous prime is 28078765601. The next prime is 28078765679. The reversal of 28078765633 is 33656787082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17074126224 + 11004639409 = 130668^2 + 104903^2 .

It is a cyclic number.

It is not a de Polignac number, because 28078765633 - 2⁵ = 28078765601 is a prime.

It is a super-3 number, since 3×28078765633³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (28078765433) 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, 14039382816 + 14039382817.

It is an arithmetic number, because the mean of its divisors is an integer number (14039382817).

Almost surely, 2^28078765633 is an apocalyptic number.

It is an amenable number.

28078765633 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078765633 is an equidigital number, since it uses as much as digits as its factorization.

28078765633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 28078765633 in words is "twenty-eight billion, seventy-eight million, seven hundred sixty-five thousand, six hundred thirty-three".