27690557 has 2 divisors, whose sum is σ = 27690558. Its totient is φ = 27690556.

The previous prime is 27690547. The next prime is 27690587. The reversal of 27690557 is 75509672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19545241 + 8145316 = 4421^2 + 2854^2 .

It is a cyclic number.

It is not a de Polignac number, because 27690557 - 2¹⁸ = 27428413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27690547) 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, 13845278 + 13845279.

It is an arithmetic number, because the mean of its divisors is an integer number (13845279).

Almost surely, 2^27690557 is an apocalyptic number.

It is an amenable number.

27690557 is a deficient number, since it is larger than the sum of its proper divisors (1).

27690557 is an equidigital number, since it uses as much as digits as its factorization.

27690557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 41.

The square root of 27690557 is about 5262.1817718509. The cubic root of 27690557 is about 302.5361184476.

The spelling of 27690557 in words is "twenty-seven million, six hundred ninety thousand, five hundred fifty-seven".