27688457 has 2 divisors, whose sum is σ = 27688458. Its totient is φ = 27688456.

The previous prime is 27688447. The next prime is 27688459. The reversal of 27688457 is 75488672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27081616 + 606841 = 5204^2 + 779^2 .

It is a cyclic number.

It is not a de Polignac number, because 27688457 - 2⁸ = 27688201 is a prime.

Together with 27688459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27688459) 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, 13844228 + 13844229.

It is an arithmetic number, because the mean of its divisors is an integer number (13844229).

Almost surely, 2^27688457 is an apocalyptic number.

It is an amenable number.

27688457 is a deficient number, since it is larger than the sum of its proper divisors (1).

27688457 is an equidigital number, since it uses as much as digits as its factorization.

27688457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 752640, while the sum is 47.

The square root of 27688457 is about 5261.9822310608. The cubic root of 27688457 is about 302.5284703300.

The spelling of 27688457 in words is "twenty-seven million, six hundred eighty-eight thousand, four hundred fifty-seven".