27640447 has 2 divisors, whose sum is σ = 27640448. Its totient is φ = 27640446.

The previous prime is 27640439. The next prime is 27640471. The reversal of 27640447 is 74404672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27640447 - 2³ = 27640439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27640427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13820223 + 13820224.

It is an arithmetic number, because the mean of its divisors is an integer number (13820224).

Almost surely, 2^27640447 is an apocalyptic number.

27640447 is a deficient number, since it is larger than the sum of its proper divisors (1).

27640447 is an equidigital number, since it uses as much as digits as its factorization.

27640447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 34.

The square root of 27640447 is about 5257.4182827696. The cubic root of 27640447 is about 302.3535142133.

The spelling of 27640447 in words is "twenty-seven million, six hundred forty thousand, four hundred forty-seven".