27968813 has 2 divisors, whose sum is σ = 27968814. Its totient is φ = 27968812.

The previous prime is 27968803. The next prime is 27968821. The reversal of 27968813 is 31886972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14915044 + 13053769 = 3862^2 + 3613^2 .

It is a cyclic number.

It is not a de Polignac number, because 27968813 - 2¹⁰ = 27967789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27968803) 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, 13984406 + 13984407.

It is an arithmetic number, because the mean of its divisors is an integer number (13984407).

Almost surely, 2^27968813 is an apocalyptic number.

It is an amenable number.

27968813 is a deficient number, since it is larger than the sum of its proper divisors (1).

27968813 is an equidigital number, since it uses as much as digits as its factorization.

27968813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 27968813 is about 5288.5549065884. The cubic root of 27968813 is about 303.5461147085.

The spelling of 27968813 in words is "twenty-seven million, nine hundred sixty-eight thousand, eight hundred thirteen".