27644166 has 48 divisors (see below), whose sum is σ = 67773888. Its totient is φ = 8375400.

The previous prime is 27644161. The next prime is 27644167. The reversal of 27644166 is 66144672.

27644166 is a `hidden beast` number, since 2 + 7 + 644 + 1 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 27644166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27644161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2761 + ... + 7931.

It is an arithmetic number, because the mean of its divisors is an integer number (1411956).

Almost surely, 2^27644166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27644166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33886944).

27644166 is an abundant number, since it is smaller than the sum of its proper divisors (40129722).

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

27644166 is a wasteful number, since it uses less digits than its factorization.

27644166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5199 (or 5187 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 27644166 is about 5257.7719615822. The cubic root of 27644166 is about 302.3670740795.

The spelling of 27644166 in words is "twenty-seven million, six hundred forty-four thousand, one hundred sixty-six".