27691757 has 2 divisors, whose sum is σ = 27691758. Its totient is φ = 27691756.

The previous prime is 27691693. The next prime is 27691801. The reversal of 27691757 is 75719672.

It is an a-pointer prime, because the next prime (27691801) can be obtained adding 27691757 to its sum of digits (44).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23222761 + 4468996 = 4819^2 + 2114^2 .

It is a cyclic number.

It is not a de Polignac number, because 27691757 - 2⁶ = 27691693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27691357) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13845878 + 13845879.

It is an arithmetic number, because the mean of its divisors is an integer number (13845879).

Almost surely, 2^27691757 is an apocalyptic number.

It is an amenable number.

27691757 is a deficient number, since it is larger than the sum of its proper divisors (1).

27691757 is an equidigital number, since it uses as much as digits as its factorization.

27691757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185220, while the sum is 44.

The square root of 27691757 is about 5262.2957917624. The cubic root of 27691757 is about 302.5404886269.

The spelling of 27691757 in words is "twenty-seven million, six hundred ninety-one thousand, seven hundred fifty-seven".