28565828657 has 2 divisors, whose sum is σ = 28565828658. Its totient is φ = 28565828656.

The previous prime is 28565828611. The next prime is 28565828741. The reversal of 28565828657 is 75682856582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21469282576 + 7096546081 = 146524^2 + 84241^2 .

It is a cyclic number.

It is not a de Polignac number, because 28565828657 - 2¹⁴ = 28565812273 is a prime.

It is a super-2 number, since 2×28565828657² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28565828657.

It is not a weakly prime, because it can be changed into another prime (28565828257) 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, 14282914328 + 14282914329.

It is an arithmetic number, because the mean of its divisors is an integer number (14282914329).

Almost surely, 2^28565828657 is an apocalyptic number.

It is an amenable number.

28565828657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28565828657 is an equidigital number, since it uses as much as digits as its factorization.

28565828657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512000, while the sum is 62.

The spelling of 28565828657 in words is "twenty-eight billion, five hundred sixty-five million, eight hundred twenty-eight thousand, six hundred fifty-seven".