27428249 has 2 divisors, whose sum is σ = 27428250. Its totient is φ = 27428248.

The previous prime is 27428243. The next prime is 27428251. The reversal of 27428249 is 94282472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18619225 + 8809024 = 4315^2 + 2968^2 .

It is a cyclic number.

It is not a de Polignac number, because 27428249 - 2⁸ = 27427993 is a prime.

It is a Sophie Germain prime.

Together with 27428251, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27428243) 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, 13714124 + 13714125.

It is an arithmetic number, because the mean of its divisors is an integer number (13714125).

Almost surely, 2^27428249 is an apocalyptic number.

It is an amenable number.

27428249 is a deficient number, since it is larger than the sum of its proper divisors (1).

27428249 is an equidigital number, since it uses as much as digits as its factorization.

27428249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

The square root of 27428249 is about 5237.1985832122. The cubic root of 27428249 is about 301.5777947391.

The spelling of 27428249 in words is "twenty-seven million, four hundred twenty-eight thousand, two hundred forty-nine".