27949745 has 4 divisors (see below), whose sum is σ = 33539700. Its totient is φ = 22359792.

The previous prime is 27949739. The next prime is 27949777. The reversal of 27949745 is 54794972.

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 8386816 + 19562929 = 2896^2 + 4423^2 .

It is a cyclic number.

It is not a de Polignac number, because 27949745 - 2¹² = 27945649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27949745.

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, 2794970 + ... + 2794979.

It is an arithmetic number, because the mean of its divisors is an integer number (8384925).

Almost surely, 2^27949745 is an apocalyptic number.

It is an amenable number.

27949745 is a deficient number, since it is larger than the sum of its proper divisors (5589955).

27949745 is an equidigital number, since it uses as much as digits as its factorization.

27949745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589954.

The product of its digits is 635040, while the sum is 47.

The square root of 27949745 is about 5286.7518383219. The cubic root of 27949745 is about 303.4771172247.

The spelling of 27949745 in words is "twenty-seven million, nine hundred forty-nine thousand, seven hundred forty-five".