27808369 has 2 divisors, whose sum is σ = 27808370. Its totient is φ = 27808368.

The previous prime is 27808327. The next prime is 27808393. The reversal of 27808369 is 96380872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26915344 + 893025 = 5188^2 + 945^2 .

It is a cyclic number.

It is not a de Polignac number, because 27808369 - 2⁷ = 27808241 is a prime.

It is a super-2 number, since 2×27808369² = 1546610772880322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27808309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13904184 + 13904185.

It is an arithmetic number, because the mean of its divisors is an integer number (13904185).

Almost surely, 2^27808369 is an apocalyptic number.

It is an amenable number.

27808369 is a deficient number, since it is larger than the sum of its proper divisors (1).

27808369 is an equidigital number, since it uses as much as digits as its factorization.

27808369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 27808369 is about 5273.3641065263. The cubic root of 27808369 is about 302.9645672313.

The spelling of 27808369 in words is "twenty-seven million, eight hundred eight thousand, three hundred sixty-nine".