27661657 has 2 divisors, whose sum is σ = 27661658. Its totient is φ = 27661656.

The previous prime is 27661651. The next prime is 27661691. The reversal of 27661657 is 75616672.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17606416 + 10055241 = 4196^2 + 3171^2 .

It is a cyclic number.

It is not a de Polignac number, because 27661657 - 2³ = 27661649 is a prime.

It is not a weakly prime, because it can be changed into another prime (27661651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13830828 + 13830829.

It is an arithmetic number, because the mean of its divisors is an integer number (13830829).

Almost surely, 2^27661657 is an apocalyptic number.

It is an amenable number.

27661657 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661657 is an equidigital number, since it uses as much as digits as its factorization.

27661657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 40.

The square root of 27661657 is about 5259.4350457060. The cubic root of 27661657 is about 302.4308318052.

The spelling of 27661657 in words is "twenty-seven million, six hundred sixty-one thousand, six hundred fifty-seven".