27788197 has 2 divisors, whose sum is σ = 27788198. Its totient is φ = 27788196.

The previous prime is 27788179. The next prime is 27788207. The reversal of 27788197 is 79188772.

Together with previous prime (27788179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27552001 + 236196 = 5249^2 + 486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27788197 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 27788197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27788297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13894098 + 13894099.

It is an arithmetic number, because the mean of its divisors is an integer number (13894099).

Almost surely, 2^27788197 is an apocalyptic number.

It is an amenable number.

27788197 is a deficient number, since it is larger than the sum of its proper divisors (1).

27788197 is an equidigital number, since it uses as much as digits as its factorization.

27788197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 49.

The square root of 27788197 is about 5271.4511284845. The cubic root of 27788197 is about 302.8912933718.

The spelling of 27788197 in words is "twenty-seven million, seven hundred eighty-eight thousand, one hundred ninety-seven".