27640243 has 2 divisors, whose sum is σ = 27640244. Its totient is φ = 27640242.

The previous prime is 27640241. The next prime is 27640267. The reversal of 27640243 is 34204672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27640243 - 2¹ = 27640241 is a prime.

Together with 27640241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (27640241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13820121 + 13820122.

It is an arithmetic number, because the mean of its divisors is an integer number (13820122).

Almost surely, 2^27640243 is an apocalyptic number.

27640243 is a deficient number, since it is larger than the sum of its proper divisors (1).

27640243 is an equidigital number, since it uses as much as digits as its factorization.

27640243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 27640243 is about 5257.3988815763. The cubic root of 27640243 is about 302.3527703726.

The spelling of 27640243 in words is "twenty-seven million, six hundred forty thousand, two hundred forty-three".