27688613 has 4 divisors (see below), whose sum is σ = 27768300. Its totient is φ = 27608928.

The previous prime is 27688601. The next prime is 27688627. The reversal of 27688613 is 31688672.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10903204 + 16785409 = 3302^2 + 4097^2 .

It is a cyclic number.

It is not a de Polignac number, because 27688613 - 2¹⁰ = 27687589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27688663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39320 + ... + 40017.

It is an arithmetic number, because the mean of its divisors is an integer number (6942075).

Almost surely, 2^27688613 is an apocalyptic number.

It is an amenable number.

27688613 is a deficient number, since it is larger than the sum of its proper divisors (79687).

27688613 is an equidigital number, since it uses as much as digits as its factorization.

27688613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79686.

The product of its digits is 96768, while the sum is 41.

The square root of 27688613 is about 5261.9970543511. The cubic root of 27688613 is about 302.5290384891.

The spelling of 27688613 in words is "twenty-seven million, six hundred eighty-eight thousand, six hundred thirteen".