28686584400809 has 2 divisors, whose sum is σ = 28686584400810. Its totient is φ = 28686584400808.

The previous prime is 28686584400787. The next prime is 28686584400847. The reversal of 28686584400809 is 90800448568682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23880843560809 + 4805740840000 = 4886803^2 + 2192200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28686584400809 is a prime.

It is not a weakly prime, because it can be changed into another prime (28686584400869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14343292200404 + 14343292200405.

It is an arithmetic number, because the mean of its divisors is an integer number (14343292200405).

Almost surely, 2^{28686584400809} is an apocalyptic number.

It is an amenable number.

28686584400809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28686584400809 is an equidigital number, since it uses as much as digits as its factorization.

28686584400809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 212336640, while the sum is 68.

The spelling of 28686584400809 in words is "twenty-eight trillion, six hundred eighty-six billion, five hundred eighty-four million, four hundred thousand, eight hundred nine".