27673781 has 2 divisors, whose sum is σ = 27673782. Its totient is φ = 27673780.

The previous prime is 27673771. The next prime is 27673787. The reversal of 27673781 is 18737672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 7107556 = 4535^2 + 2666^2 .

It is a cyclic number.

It is not a de Polignac number, because 27673781 - 2⁶ = 27673717 is a prime.

It is a super-2 number, since 2×27673781² = 1531676309671922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27673787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13836890 + 13836891.

It is an arithmetic number, because the mean of its divisors is an integer number (13836891).

Almost surely, 2^27673781 is an apocalyptic number.

It is an amenable number.

27673781 is a deficient number, since it is larger than the sum of its proper divisors (1).

27673781 is an equidigital number, since it uses as much as digits as its factorization.

27673781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 41.

The square root of 27673781 is about 5260.5875147173. The cubic root of 27673781 is about 302.4750101160.

The spelling of 27673781 in words is "twenty-seven million, six hundred seventy-three thousand, seven hundred eighty-one".