27991448 has 16 divisors (see below), whose sum is σ = 52614960. Its totient is φ = 13960800.

The previous prime is 27991399. The next prime is 27991477. The reversal of 27991448 is 84419972.

It is a super-2 number, since 2×27991448² = 1567042322273408, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27991399 and 27991408.

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, 788 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (3288435).

Almost surely, 2^27991448 is an apocalyptic number.

It is an amenable number.

27991448 is a deficient number, since it is larger than the sum of its proper divisors (24623512).

27991448 is a wasteful number, since it uses less digits than its factorization.

27991448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8738 (or 8734 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 27991448 is about 5290.6944723732. The cubic root of 27991448 is about 303.6279786718.

The spelling of 27991448 in words is "twenty-seven million, nine hundred ninety-one thousand, four hundred forty-eight".