27755389 has 2 divisors, whose sum is σ = 27755390. Its totient is φ = 27755388.

The previous prime is 27755383. The next prime is 27755393. The reversal of 27755389 is 98355772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18207289 + 9548100 = 4267^2 + 3090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27755389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27755383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13877694 + 13877695.

It is an arithmetic number, because the mean of its divisors is an integer number (13877695).

Almost surely, 2^27755389 is an apocalyptic number.

It is an amenable number.

27755389 is a deficient number, since it is larger than the sum of its proper divisors (1).

27755389 is an equidigital number, since it uses as much as digits as its factorization.

27755389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529200, while the sum is 46.

The square root of 27755389 is about 5268.3383528395. The cubic root of 27755389 is about 302.7720440503.

The spelling of 27755389 in words is "twenty-seven million, seven hundred fifty-five thousand, three hundred eighty-nine".