27985597 has 2 divisors, whose sum is σ = 27985598. Its totient is φ = 27985596.

The previous prime is 27985577. The next prime is 27985603. The reversal of 27985597 is 79558972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16736281 + 11249316 = 4091^2 + 3354^2 .

It is a cyclic number.

It is not a de Polignac number, because 27985597 - 2⁷ = 27985469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27985547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13992798 + 13992799.

It is an arithmetic number, because the mean of its divisors is an integer number (13992799).

Almost surely, 2^27985597 is an apocalyptic number.

It is an amenable number.

27985597 is a deficient number, since it is larger than the sum of its proper divisors (1).

27985597 is an equidigital number, since it uses as much as digits as its factorization.

27985597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587600, while the sum is 52.

The square root of 27985597 is about 5290.1414914915. The cubic root of 27985597 is about 303.6068216015.

It can be divided in two parts, 27985 and 597, that added together give a palindrome (28582).

The spelling of 27985597 in words is "twenty-seven million, nine hundred eighty-five thousand, five hundred ninety-seven".