27828289 has 2 divisors, whose sum is σ = 27828290. Its totient is φ = 27828288.

The previous prime is 27828211. The next prime is 27828301. The reversal of 27828289 is 98282872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14745600 + 13082689 = 3840^2 + 3617^2 .

It is a cyclic number.

It is not a de Polignac number, because 27828289 - 2⁷ = 27828161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27828209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13914144 + 13914145.

It is an arithmetic number, because the mean of its divisors is an integer number (13914145).

Almost surely, 2^27828289 is an apocalyptic number.

It is an amenable number.

27828289 is a deficient number, since it is larger than the sum of its proper divisors (1).

27828289 is an equidigital number, since it uses as much as digits as its factorization.

27828289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 46.

The square root of 27828289 is about 5275.2525058048. The cubic root of 27828289 is about 303.0368909470.

The spelling of 27828289 in words is "twenty-seven million, eight hundred twenty-eight thousand, two hundred eighty-nine".