27642749 has 2 divisors, whose sum is σ = 27642750. Its totient is φ = 27642748.

The previous prime is 27642743. The next prime is 27642761. The reversal of 27642749 is 94724672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 11682724 = 3995^2 + 3418^2 .

It is a cyclic number.

It is not a de Polignac number, because 27642749 - 2²⁰ = 26594173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27642743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13821374 + 13821375.

It is an arithmetic number, because the mean of its divisors is an integer number (13821375).

Almost surely, 2^27642749 is an apocalyptic number.

It is an amenable number.

27642749 is a deficient number, since it is larger than the sum of its proper divisors (1).

27642749 is an equidigital number, since it uses as much as digits as its factorization.

27642749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 41.

The square root of 27642749 is about 5257.6372069590. The cubic root of 27642749 is about 302.3619076915.

The spelling of 27642749 in words is "twenty-seven million, six hundred forty-two thousand, seven hundred forty-nine".