27804317509 has 4 divisors (see below), whose sum is σ = 27846897516. Its totient is φ = 27761737504.

The previous prime is 27804317483. The next prime is 27804317531. The reversal of 27804317509 is 90571340872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2091232900 + 25713084609 = 45730^2 + 160353^2 .

It is a cyclic number.

It is not a de Polignac number, because 27804317509 - 2⁷ = 27804317381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27804317549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21289024 + ... + 21290329.

It is an arithmetic number, because the mean of its divisors is an integer number (6961724379).

Almost surely, 2^27804317509 is an apocalyptic number.

It is an amenable number.

27804317509 is a deficient number, since it is larger than the sum of its proper divisors (42580007).

27804317509 is an equidigital number, since it uses as much as digits as its factorization.

27804317509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42580006.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 27804317509 in words is "twenty-seven billion, eight hundred four million, three hundred seventeen thousand, five hundred nine".