27685993 has 2 divisors, whose sum is σ = 27685994. Its totient is φ = 27685992.

The previous prime is 27685967. The next prime is 27686041. The reversal of 27685993 is 39958672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20358144 + 7327849 = 4512^2 + 2707^2 .

It is a cyclic number.

It is not a de Polignac number, because 27685993 - 2⁹ = 27685481 is a prime.

It is not a weakly prime, because it can be changed into another prime (27685913) 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, 13842996 + 13842997.

It is an arithmetic number, because the mean of its divisors is an integer number (13842997).

Almost surely, 2^27685993 is an apocalyptic number.

It is an amenable number.

27685993 is a deficient number, since it is larger than the sum of its proper divisors (1).

27685993 is an equidigital number, since it uses as much as digits as its factorization.

27685993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 27685993 is about 5261.7480935522. The cubic root of 27685993 is about 302.5194960456.

The spelling of 27685993 in words is "twenty-seven million, six hundred eighty-five thousand, nine hundred ninety-three".