27991444 has 12 divisors (see below), whose sum is σ = 52753204. Its totient is φ = 12919104.

The previous prime is 27991399. The next prime is 27991477. The reversal of 27991444 is 44419972.

It can be written as a sum of positive squares in 2 ways, for example, as 1468944 + 26522500 = 1212^2 + 5150^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 27991397 and 27991406.

It is a congruent 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, 269097 + ... + 269200.

Almost surely, 2^27991444 is an apocalyptic number.

It is an amenable number.

27991444 is a deficient number, since it is larger than the sum of its proper divisors (24761760).

27991444 is a wasteful number, since it uses less digits than its factorization.

27991444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538314 (or 538312 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 27991444 is about 5290.6940943509. The cubic root of 27991444 is about 303.6279642089.

The spelling of 27991444 in words is "twenty-seven million, nine hundred ninety-one thousand, four hundred forty-four".