28566909869 has 2 divisors, whose sum is σ = 28566909870. Its totient is φ = 28566909868.

The previous prime is 28566909829. The next prime is 28566909893. The reversal of 28566909869 is 96890966582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27336654244 + 1230255625 = 165338^2 + 35075^2 .

It is a cyclic number.

It is not a de Polignac number, because 28566909869 - 2¹⁶ = 28566844333 is a prime.

It is a super-2 number, since 2×28566909869² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28566909799 and 28566909808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28566909829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14283454934 + 14283454935.

It is an arithmetic number, because the mean of its divisors is an integer number (14283454935).

Almost surely, 2^28566909869 is an apocalyptic number.

It is an amenable number.

28566909869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28566909869 is an equidigital number, since it uses as much as digits as its factorization.

28566909869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100776960, while the sum is 68.

The spelling of 28566909869 in words is "twenty-eight billion, five hundred sixty-six million, nine hundred nine thousand, eight hundred sixty-nine".