27457691 has 2 divisors, whose sum is σ = 27457692. Its totient is φ = 27457690.

The previous prime is 27457687. The next prime is 27457769. The reversal of 27457691 is 19675472.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27457691 - 2² = 27457687 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (27457631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13728845 + 13728846.

It is an arithmetic number, because the mean of its divisors is an integer number (13728846).

Almost surely, 2^27457691 is an apocalyptic number.

27457691 is a deficient number, since it is larger than the sum of its proper divisors (1).

27457691 is an equidigital number, since it uses as much as digits as its factorization.

27457691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The square root of 27457691 is about 5240.0086831989. The cubic root of 27457691 is about 301.6856625842.

The spelling of 27457691 in words is "twenty-seven million, four hundred fifty-seven thousand, six hundred ninety-one".