27916865 has 4 divisors (see below), whose sum is σ = 33500244. Its totient is φ = 22333488.

The previous prime is 27916843. The next prime is 27916883. The reversal of 27916865 is 56861972.

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 3936256 + 23980609 = 1984^2 + 4897^2 .

It is a cyclic number.

It is not a de Polignac number, because 27916865 - 2²⁴ = 11139649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2791682 + ... + 2791691.

It is an arithmetic number, because the mean of its divisors is an integer number (8375061).

Almost surely, 2^27916865 is an apocalyptic number.

It is an amenable number.

27916865 is a deficient number, since it is larger than the sum of its proper divisors (5583379).

27916865 is an equidigital number, since it uses as much as digits as its factorization.

27916865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5583378.

The product of its digits is 181440, while the sum is 44.

The square root of 27916865 is about 5283.6412633713. The cubic root of 27916865 is about 303.3580673253.

The spelling of 27916865 in words is "twenty-seven million, nine hundred sixteen thousand, eight hundred sixty-five".