28094293155809 has 2 divisors, whose sum is σ = 28094293155810. Its totient is φ = 28094293155808.

The previous prime is 28094293155751. The next prime is 28094293155833. The reversal of 28094293155809 is 90855139249082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14434224577600 + 13660068578209 = 3799240^2 + 3695953^2 .

It is a cyclic number.

It is not a de Polignac number, because 28094293155809 - 2²⁸ = 28094024720353 is a prime.

It is not a weakly prime, because it can be changed into another prime (28094293155839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14047146577904 + 14047146577905.

It is an arithmetic number, because the mean of its divisors is an integer number (14047146577905).

Almost surely, 2^{28094293155809} is an apocalyptic number.

It is an amenable number.

28094293155809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28094293155809 is an equidigital number, since it uses as much as digits as its factorization.

28094293155809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55987200, while the sum is 65.

The spelling of 28094293155809 in words is "twenty-eight trillion, ninety-four billion, two hundred ninety-three million, one hundred fifty-five thousand, eight hundred nine".