27666445 has 4 divisors (see below), whose sum is σ = 33199740. Its totient is φ = 22133152.

The previous prime is 27666439. The next prime is 27666449. The reversal of 27666445 is 54466672.

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 9253764 + 18412681 = 3042^2 + 4291^2 .

It is a cyclic number.

It is not a de Polignac number, because 27666445 - 2⁹ = 27665933 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 27666398 and 27666407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27666449) 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, 2766640 + ... + 2766649.

It is an arithmetic number, because the mean of its divisors is an integer number (8299935).

Almost surely, 2^27666445 is an apocalyptic number.

It is an amenable number.

27666445 is a deficient number, since it is larger than the sum of its proper divisors (5533295).

27666445 is an equidigital number, since it uses as much as digits as its factorization.

27666445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5533294.

The product of its digits is 241920, while the sum is 40.

The square root of 27666445 is about 5259.8902079796. The cubic root of 27666445 is about 302.4482802090.

The spelling of 27666445 in words is "twenty-seven million, six hundred sixty-six thousand, four hundred forty-five".