27780281 has 2 divisors, whose sum is σ = 27780282. Its totient is φ = 27780280.

The previous prime is 27780217. The next prime is 27780293. The reversal of 27780281 is 18208772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 12138256 = 3955^2 + 3484^2 .

It is a cyclic number.

It is not a de Polignac number, because 27780281 - 2⁶ = 27780217 is a prime.

It is a super-2 number, since 2×27780281² = 1543488024877922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27780211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890140 + 13890141.

It is an arithmetic number, because the mean of its divisors is an integer number (13890141).

Almost surely, 2^27780281 is an apocalyptic number.

It is an amenable number.

27780281 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780281 is an equidigital number, since it uses as much as digits as its factorization.

27780281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 27780281 is about 5270.7002381088. The cubic root of 27780281 is about 302.8625291787.

The spelling of 27780281 in words is "twenty-seven million, seven hundred eighty thousand, two hundred eighty-one".