28043816204609 has 2 divisors, whose sum is σ = 28043816204610. Its totient is φ = 28043816204608.

The previous prime is 28043816204563. The next prime is 28043816204687. The reversal of 28043816204609 is 90640261834082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27722825971009 + 320990233600 = 5265247^2 + 566560^2 .

It is a cyclic number.

It is not a de Polignac number, because 28043816204609 - 2³² = 28039521237313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28043816203609) 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, 14021908102304 + 14021908102305.

It is an arithmetic number, because the mean of its divisors is an integer number (14021908102305).

Almost surely, 2^{28043816204609} is an apocalyptic number.

It is an amenable number.

28043816204609 is a deficient number, since it is larger than the sum of its proper divisors (1).

28043816204609 is an equidigital number, since it uses as much as digits as its factorization.

28043816204609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 28043816204609 in words is "twenty-eight trillion, forty-three billion, eight hundred sixteen million, two hundred four thousand, six hundred nine".