27825869 has 2 divisors, whose sum is σ = 27825870. Its totient is φ = 27825868.

The previous prime is 27825857. The next prime is 27825871. The reversal of 27825869 is 96852872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27510025 + 315844 = 5245^2 + 562^2 .

It is a cyclic number.

It is not a de Polignac number, because 27825869 - 2⁸ = 27825613 is a prime.

It is a super-2 number, since 2×27825869² = 1548557971210322, which contains 22 as substring.

Together with 27825871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27825829) 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, 13912934 + 13912935.

It is an arithmetic number, because the mean of its divisors is an integer number (13912935).

Almost surely, 2^27825869 is an apocalyptic number.

It is an amenable number.

27825869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27825869 is an equidigital number, since it uses as much as digits as its factorization.

27825869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 47.

The square root of 27825869 is about 5275.0231279114. The cubic root of 27825869 is about 303.0281064743.

The spelling of 27825869 in words is "twenty-seven million, eight hundred twenty-five thousand, eight hundred sixty-nine".