27666378 has 48 divisors (see below), whose sum is σ = 66246336. Its totient is φ = 8300160.

The previous prime is 27666311. The next prime is 27666391. The reversal of 27666378 is 87366672.

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 23 ways as a sum of consecutive naturals, for example, 5073 + ... + 9003.

It is an arithmetic number, because the mean of its divisors is an integer number (1380132).

Almost surely, 2^27666378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27666378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33123168).

27666378 is an abundant number, since it is smaller than the sum of its proper divisors (38579958).

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

27666378 is a wasteful number, since it uses less digits than its factorization.

27666378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3979 (or 3976 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 27666378 is about 5259.8838390215. The cubic root of 27666378 is about 302.4480360619.

The spelling of 27666378 in words is "twenty-seven million, six hundred sixty-six thousand, three hundred seventy-eight".