28565828257 has 2 divisors, whose sum is σ = 28565828258. Its totient is φ = 28565828256.

The previous prime is 28565828227. The next prime is 28565828267. The reversal of 28565828257 is 75282856582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19052556961 + 9513271296 = 138031^2 + 97536^2 .

It is a cyclic number.

It is not a de Polignac number, because 28565828257 - 2³¹ = 26418344609 is a prime.

It is not a weakly prime, because it can be changed into another prime (28565828227) 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, 14282914128 + 14282914129.

It is an arithmetic number, because the mean of its divisors is an integer number (14282914129).

Almost surely, 2^28565828257 is an apocalyptic number.

It is an amenable number.

28565828257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28565828257 is an equidigital number, since it uses as much as digits as its factorization.

28565828257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504000, while the sum is 58.

The spelling of 28565828257 in words is "twenty-eight billion, five hundred sixty-five million, eight hundred twenty-eight thousand, two hundred fifty-seven".