28686584400787 has 2 divisors, whose sum is σ = 28686584400788. Its totient is φ = 28686584400786.

The previous prime is 28686584400769. The next prime is 28686584400809. The reversal of 28686584400787 is 78700448568682.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28686584400787 - 2³¹ = 28684436917139 is a prime.

It is not a weakly prime, because it can be changed into another prime (28686584403787) 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, 14343292200393 + 14343292200394.

It is an arithmetic number, because the mean of its divisors is an integer number (14343292200394).

Almost surely, 2^{28686584400787} is an apocalyptic number.

28686584400787 is a deficient number, since it is larger than the sum of its proper divisors (1).

28686584400787 is an equidigital number, since it uses as much as digits as its factorization.

28686584400787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1156055040, while the sum is 73.

The spelling of 28686584400787 in words is "twenty-eight trillion, six hundred eighty-six billion, five hundred eighty-four million, four hundred thousand, seven hundred eighty-seven".