28344866787689 has 2 divisors, whose sum is σ = 28344866787690. Its totient is φ = 28344866787688.

The previous prime is 28344866787673. The next prime is 28344866787739. The reversal of 28344866787689 is 98678766844382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27896513341225 + 448353446464 = 5281715^2 + 669592^2 .

It is a cyclic number.

It is not a de Polignac number, because 28344866787689 - 2⁴ = 28344866787673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28344866787689.

It is not a weakly prime, because it can be changed into another prime (28344866787889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14172433393844 + 14172433393845.

It is an arithmetic number, because the mean of its divisors is an integer number (14172433393845).

Almost surely, 2^{28344866787689} is an apocalyptic number.

It is an amenable number.

28344866787689 is a deficient number, since it is larger than the sum of its proper divisors (1).

28344866787689 is an equidigital number, since it uses as much as digits as its factorization.

28344866787689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37456183296, while the sum is 86.

The spelling of 28344866787689 in words is "twenty-eight trillion, three hundred forty-four billion, eight hundred sixty-six million, seven hundred eighty-seven thousand, six hundred eighty-nine".