27881279 has 2 divisors, whose sum is σ = 27881280. Its totient is φ = 27881278.

The previous prime is 27881263. The next prime is 27881291. The reversal of 27881279 is 97218872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27881279 - 2⁴ = 27881263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27881779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13940639 + 13940640.

It is an arithmetic number, because the mean of its divisors is an integer number (13940640).

Almost surely, 2^27881279 is an apocalyptic number.

27881279 is a deficient number, since it is larger than the sum of its proper divisors (1).

27881279 is an equidigital number, since it uses as much as digits as its factorization.

27881279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 44.

The square root of 27881279 is about 5280.2726255374. The cubic root of 27881279 is about 303.2291143261.

The spelling of 27881279 in words is "twenty-seven million, eight hundred eighty-one thousand, two hundred seventy-nine".