28643408585993 has 2 divisors, whose sum is σ = 28643408585994. Its totient is φ = 28643408585992.

The previous prime is 28643408585971. The next prime is 28643408586071. The reversal of 28643408585993 is 39958580434682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20065140824569 + 8578267761424 = 4479413^2 + 2928868^2 .

It is a cyclic number.

It is not a de Polignac number, because 28643408585993 - 2¹⁰ = 28643408584969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28643408585993.

It is not a weakly prime, because it can be changed into another prime (28643408585923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14321704292996 + 14321704292997.

It is an arithmetic number, because the mean of its divisors is an integer number (14321704292997).

Almost surely, 2^{28643408585993} is an apocalyptic number.

It is an amenable number.

28643408585993 is a deficient number, since it is larger than the sum of its proper divisors (1).

28643408585993 is an equidigital number, since it uses as much as digits as its factorization.

28643408585993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1791590400, while the sum is 74.

The spelling of 28643408585993 in words is "twenty-eight trillion, six hundred forty-three billion, four hundred eight million, five hundred eighty-five thousand, nine hundred ninety-three".