27639641 has 2 divisors, whose sum is σ = 27639642. Its totient is φ = 27639640.

The previous prime is 27639611. The next prime is 27639653. The reversal of 27639641 is 14693672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20214016 + 7425625 = 4496^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 27639641 - 2¹⁴ = 27623257 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27639595 and 27639604.

It is not a weakly prime, because it can be changed into another prime (27639611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13819820 + 13819821.

It is an arithmetic number, because the mean of its divisors is an integer number (13819821).

Almost surely, 2^27639641 is an apocalyptic number.

It is an amenable number.

27639641 is a deficient number, since it is larger than the sum of its proper divisors (1).

27639641 is an equidigital number, since it uses as much as digits as its factorization.

27639641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 27639641 is about 5257.3416286180. The cubic root of 27639641 is about 302.3505752919.

The spelling of 27639641 in words is "twenty-seven million, six hundred thirty-nine thousand, six hundred forty-one".