16566628 has 12 divisors (see below), whose sum is σ = 31221820. Its totient is φ = 7646112.

The previous prime is 16566611. The next prime is 16566637. The reversal of 16566628 is 82666561.

It can be written as a sum of positive squares in 2 ways, for example, as 9048064 + 7518564 = 3008^2 + 2742^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 16.

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, 159243 + ... + 159346.

Almost surely, 2^16566628 is an apocalyptic number.

It is an amenable number.

16566628 is a deficient number, since it is larger than the sum of its proper divisors (14655192).

16566628 is a wasteful number, since it uses less digits than its factorization.

16566628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318606 (or 318604 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 16566628 is about 4070.2122794763. The cubic root of 16566628 is about 254.9243810124.

The spelling of 16566628 in words is "sixteen million, five hundred sixty-six thousand, six hundred twenty-eight".