27478289 has 2 divisors, whose sum is σ = 27478290. Its totient is φ = 27478288.

The previous prime is 27478279. The next prime is 27478291. The reversal of 27478289 is 98287472.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22165264 + 5313025 = 4708^2 + 2305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27478289 is a prime.

Together with 27478291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27478259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13739144 + 13739145.

It is an arithmetic number, because the mean of its divisors is an integer number (13739145).

Almost surely, 2^27478289 is an apocalyptic number.

It is an amenable number.

27478289 is a deficient number, since it is larger than the sum of its proper divisors (1).

27478289 is an equidigital number, since it uses as much as digits as its factorization.

27478289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 27478289 is about 5241.9737694880. The cubic root of 27478289 is about 301.7610824734.

The spelling of 27478289 in words is "twenty-seven million, four hundred seventy-eight thousand, two hundred eighty-nine".