27645745 has 4 divisors (see below), whose sum is σ = 33174900. Its totient is φ = 22116592.

The previous prime is 27645733. The next prime is 27645763. The reversal of 27645745 is 54754672.

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 17986081 + 9659664 = 4241^2 + 3108^2 .

It is a cyclic number.

It is not a de Polignac number, because 27645745 - 2¹³ = 27637553 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 = 27645698 and 27645707.

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, 2764570 + ... + 2764579.

It is an arithmetic number, because the mean of its divisors is an integer number (8293725).

Almost surely, 2^27645745 is an apocalyptic number.

It is an amenable number.

27645745 is a deficient number, since it is larger than the sum of its proper divisors (5529155).

27645745 is an equidigital number, since it uses as much as digits as its factorization.

27645745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5529154.

The product of its digits is 235200, while the sum is 40.

The square root of 27645745 is about 5257.9221180995. The cubic root of 27645745 is about 302.3728309122.

The spelling of 27645745 in words is "twenty-seven million, six hundred forty-five thousand, seven hundred forty-five".