28605775049 has 2 divisors, whose sum is σ = 28605775050. Its totient is φ = 28605775048.

The previous prime is 28605775031. The next prime is 28605775057. The reversal of 28605775049 is 94057750682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22104255625 + 6501519424 = 148675^2 + 80632^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28605775049 is a prime.

It is not a weakly prime, because it can be changed into another prime (28605775019) 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, 14302887524 + 14302887525.

It is an arithmetic number, because the mean of its divisors is an integer number (14302887525).

Almost surely, 2^28605775049 is an apocalyptic number.

It is an amenable number.

28605775049 is a deficient number, since it is larger than the sum of its proper divisors (1).

28605775049 is an equidigital number, since it uses as much as digits as its factorization.

28605775049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 28605775049 in words is "twenty-eight billion, six hundred five million, seven hundred seventy-five thousand, forty-nine".