27820666 has 16 divisors (see below), whose sum is σ = 42254784. Its totient is φ = 13737184.

The previous prime is 27820627. The next prime is 27820691. The reversal of 27820666 is 66602872.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 105651 + ... + 105913.

It is an arithmetic number, because the mean of its divisors is an integer number (2640924).

Almost surely, 2^27820666 is an apocalyptic number.

27820666 is a deficient number, since it is larger than the sum of its proper divisors (14434118).

27820666 is a wasteful number, since it uses less digits than its factorization.

27820666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 27820666 is about 5274.5299316622. The cubic root of 27820666 is about 303.0092181331.

The spelling of 27820666 in words is "twenty-seven million, eight hundred twenty thousand, six hundred sixty-six".