27748661 has 2 divisors, whose sum is σ = 27748662. Its totient is φ = 27748660.

The previous prime is 27748657. The next prime is 27748663. The reversal of 27748661 is 16684772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25816561 + 1932100 = 5081^2 + 1390^2 .

It is a cyclic number.

It is not a de Polignac number, because 27748661 - 2² = 27748657 is a prime.

Together with 27748663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27748663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13874330 + 13874331.

It is an arithmetic number, because the mean of its divisors is an integer number (13874331).

Almost surely, 2^27748661 is an apocalyptic number.

It is an amenable number.

27748661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27748661 is an equidigital number, since it uses as much as digits as its factorization.

27748661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 41.

The square root of 27748661 is about 5267.6997826376. The cubic root of 27748661 is about 302.7475777514.

The spelling of 27748661 in words is "twenty-seven million, seven hundred forty-eight thousand, six hundred sixty-one".