27891216 has 50 divisors (see below), whose sum is σ = 80729022. Its totient is φ = 9296640.

The previous prime is 27891191. The next prime is 27891239. The reversal of 27891216 is 61219872.

It can be written as a sum of positive squares in only one way, i.e., 23970816 + 3920400 = 4896^2 + 1980^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9465 + ... + 12056.

Almost surely, 2^27891216 is an apocalyptic number.

It is an amenable number.

27891216 is an abundant number, since it is smaller than the sum of its proper divisors (52837806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27891216 is a wasteful number, since it uses less digits than its factorization.

27891216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21541 (or 21526 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 27891216 is about 5281.2134969153. The cubic root of 27891216 is about 303.2651340727.

It can be divided in two parts, 2789 and 1216, that added together give a triangular number (4005 = T₈₉).

The spelling of 27891216 in words is "twenty-seven million, eight hundred ninety-one thousand, two hundred sixteen".