27638971 has 2 divisors, whose sum is σ = 27638972. Its totient is φ = 27638970.

The previous prime is 27638921. The next prime is 27638987. The reversal of 27638971 is 17983672.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27638971 - 2¹⁵ = 27606203 is a prime.

It is not a weakly prime, because it can be changed into another prime (27638921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13819485 + 13819486.

It is an arithmetic number, because the mean of its divisors is an integer number (13819486).

Almost surely, 2^27638971 is an apocalyptic number.

27638971 is a deficient number, since it is larger than the sum of its proper divisors (1).

27638971 is an equidigital number, since it uses as much as digits as its factorization.

27638971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 43.

The square root of 27638971 is about 5257.2779078150. The cubic root of 27638971 is about 302.3481322244.

The spelling of 27638971 in words is "twenty-seven million, six hundred thirty-eight thousand, nine hundred seventy-one".