27738661 has 2 divisors, whose sum is σ = 27738662. Its totient is φ = 27738660.

The previous prime is 27738653. The next prime is 27738671. The reversal of 27738661 is 16683772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26718561 + 1020100 = 5169^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 27738661 - 2³ = 27738653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27738671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13869330 + 13869331.

It is an arithmetic number, because the mean of its divisors is an integer number (13869331).

Almost surely, 2^27738661 is an apocalyptic number.

It is an amenable number.

27738661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27738661 is an equidigital number, since it uses as much as digits as its factorization.

27738661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 27738661 is about 5266.7505162102. The cubic root of 27738661 is about 302.7112055516.

The spelling of 27738661 in words is "twenty-seven million, seven hundred thirty-eight thousand, six hundred sixty-one".