27945845 has 4 divisors (see below), whose sum is σ = 33535020. Its totient is φ = 22356672.

The previous prime is 27945839. The next prime is 27945859. The reversal of 27945845 is 54854972.

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 18861649 + 9084196 = 4343^2 + 3014^2 .

It is a cyclic number.

It is not a de Polignac number, because 27945845 - 2¹⁶ = 27880309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27945796 and 27945805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2794580 + ... + 2794589.

It is an arithmetic number, because the mean of its divisors is an integer number (8383755).

Almost surely, 2^27945845 is an apocalyptic number.

It is an amenable number.

27945845 is a deficient number, since it is larger than the sum of its proper divisors (5589175).

27945845 is an equidigital number, since it uses as much as digits as its factorization.

27945845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5589174.

The product of its digits is 403200, while the sum is 44.

The square root of 27945845 is about 5286.3829789375. The cubic root of 27945845 is about 303.4630012246.

The spelling of 27945845 in words is "twenty-seven million, nine hundred forty-five thousand, eight hundred forty-five".