27806081 has 2 divisors, whose sum is σ = 27806082. Its totient is φ = 27806080.

The previous prime is 27806069. The next prime is 27806083. The reversal of 27806081 is 18060872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27133681 + 672400 = 5209^2 + 820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27806081 is a prime.

It is a super-2 number, since 2×27806081² = 1546356281157122, which contains 22 as substring.

Together with 27806083, 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 (27806083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13903040 + 13903041.

It is an arithmetic number, because the mean of its divisors is an integer number (13903041).

Almost surely, 2^27806081 is an apocalyptic number.

It is an amenable number.

27806081 is a deficient number, since it is larger than the sum of its proper divisors (1).

27806081 is an equidigital number, since it uses as much as digits as its factorization.

27806081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 27806081 is about 5273.1471627483. The cubic root of 27806081 is about 302.9562579589.

The spelling of 27806081 in words is "twenty-seven million, eight hundred six thousand, eighty-one".