27997559 has 2 divisors, whose sum is σ = 27997560. Its totient is φ = 27997558.

The previous prime is 27997523. The next prime is 27997577. The reversal of 27997559 is 95579972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27997559 - 2²⁰ = 26948983 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27997559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27997579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13998779 + 13998780.

It is an arithmetic number, because the mean of its divisors is an integer number (13998780).

Almost surely, 2^27997559 is an apocalyptic number.

27997559 is a deficient number, since it is larger than the sum of its proper divisors (1).

27997559 is an equidigital number, since it uses as much as digits as its factorization.

27997559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1786050, while the sum is 53.

The square root of 27997559 is about 5291.2719642823. The cubic root of 27997559 is about 303.6500727482.

The spelling of 27997559 in words is "twenty-seven million, nine hundred ninety-seven thousand, five hundred fifty-nine".