27287681 has 2 divisors, whose sum is σ = 27287682. Its totient is φ = 27287680.

The previous prime is 27287647. The next prime is 27287713. The reversal of 27287681 is 18678272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26615281 + 672400 = 5159^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 27287681 - 2¹⁴ = 27271297 is a prime.

It is a super-2 number, since 2×27287681² = 1489235068715522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27287641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13643840 + 13643841.

It is an arithmetic number, because the mean of its divisors is an integer number (13643841).

Almost surely, 2^27287681 is an apocalyptic number.

It is an amenable number.

27287681 is a deficient number, since it is larger than the sum of its proper divisors (1).

27287681 is an equidigital number, since it uses as much as digits as its factorization.

27287681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 41.

The square root of 27287681 is about 5223.7611928571. The cubic root of 27287681 is about 301.0617232317.

The spelling of 27287681 in words is "twenty-seven million, two hundred eighty-seven thousand, six hundred eighty-one".