27661849 has 2 divisors, whose sum is σ = 27661850. Its totient is φ = 27661848.

The previous prime is 27661819. The next prime is 27661859. The reversal of 27661849 is 94816672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27248400 + 413449 = 5220^2 + 643^2 .

It is a cyclic number.

It is not a de Polignac number, because 27661849 - 2⁷ = 27661721 is a prime.

It is not a weakly prime, because it can be changed into another prime (27661819) 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, 13830924 + 13830925.

It is an arithmetic number, because the mean of its divisors is an integer number (13830925).

Almost surely, 2^27661849 is an apocalyptic number.

It is an amenable number.

27661849 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661849 is an equidigital number, since it uses as much as digits as its factorization.

27661849 is an odious number, because the sum of its binary digits is odd.

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

The square root of 27661849 is about 5259.4532985853. The cubic root of 27661849 is about 302.4315315294.

The spelling of 27661849 in words is "twenty-seven million, six hundred sixty-one thousand, eight hundred forty-nine".