16646428 has 6 divisors (see below), whose sum is σ = 29131256. Its totient is φ = 8323212.

The previous prime is 16646401. The next prime is 16646431. The reversal of 16646428 is 82464661.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2080800 + ... + 2080807.

Almost surely, 2^16646428 is an apocalyptic number.

It is an amenable number.

16646428 is a deficient number, since it is larger than the sum of its proper divisors (12484828).

16646428 is a wasteful number, since it uses less digits than its factorization.

16646428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4161611 (or 4161609 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 16646428 is about 4080.0034313711. The cubic root of 16646428 is about 255.3330417107. Note that the first 3 decimals are identical.

The spelling of 16646428 in words is "sixteen million, six hundred forty-six thousand, four hundred twenty-eight".