27775457 has 2 divisors, whose sum is σ = 27775458. Its totient is φ = 27775456.

The previous prime is 27775441. The next prime is 27775459. The reversal of 27775457 is 75457772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 2383936 = 5039^2 + 1544^2 .

It is a cyclic number.

It is not a de Polignac number, because 27775457 - 2⁴ = 27775441 is a prime.

Together with 27775459, 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 (27775459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13887728 + 13887729.

It is an arithmetic number, because the mean of its divisors is an integer number (13887729).

Almost surely, 2^27775457 is an apocalyptic number.

It is an amenable number.

27775457 is a deficient number, since it is larger than the sum of its proper divisors (1).

27775457 is an equidigital number, since it uses as much as digits as its factorization.

27775457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480200, while the sum is 44.

The square root of 27775457 is about 5270.2425940368. The cubic root of 27775457 is about 302.8449976376.

The spelling of 27775457 in words is "twenty-seven million, seven hundred seventy-five thousand, four hundred fifty-seven".