27816749 has 2 divisors, whose sum is σ = 27816750. Its totient is φ = 27816748.

The previous prime is 27816643. The next prime is 27816751. The reversal of 27816749 is 94761872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26728900 + 1087849 = 5170^2 + 1043^2 .

It is a cyclic number.

It is not a de Polignac number, because 27816749 - 2²⁰ = 26768173 is a prime.

Together with 27816751, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27816799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13908374 + 13908375.

It is an arithmetic number, because the mean of its divisors is an integer number (13908375).

Almost surely, 2^27816749 is an apocalyptic number.

It is an amenable number.

27816749 is a deficient number, since it is larger than the sum of its proper divisors (1).

27816749 is an equidigital number, since it uses as much as digits as its factorization.

27816749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 27816749 is about 5274.1586058821. The cubic root of 27816749 is about 302.9949967768.

The spelling of 27816749 in words is "twenty-seven million, eight hundred sixteen thousand, seven hundred forty-nine".