27123661 has 8 divisors (see below), whose sum is σ = 27585720. Its totient is φ = 26664192.

The previous prime is 27123637. The next prime is 27123683. The reversal of 27123661 is 16632172.

It can be written as a sum of positive squares in 4 ways, for example, as 280900 + 26842761 = 530^2 + 5181^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27123661 - 2⁷ = 27123533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27123631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41211 + ... + 41863.

It is an arithmetic number, because the mean of its divisors is an integer number (3448215).

Almost surely, 2^27123661 is an apocalyptic number.

It is an amenable number.

27123661 is a deficient number, since it is larger than the sum of its proper divisors (462059).

27123661 is an equidigital number, since it uses as much as digits as its factorization.

27123661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295.

The product of its digits is 3024, while the sum is 28.

The square root of 27123661 is about 5208.0381142999. The cubic root of 27123661 is about 300.4573062528.

It can be divided in two parts, 271 and 23661, that added together give a palindrome (23932).

The spelling of 27123661 in words is "twenty-seven million, one hundred twenty-three thousand, six hundred sixty-one".