16428644 has 12 divisors (see below), whose sum is σ = 28896000. Its totient is φ = 8172648.

The previous prime is 16428611. The next prime is 16428653. The reversal of 16428644 is 44682461.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9524 + ... + 11115.

It is an arithmetic number, because the mean of its divisors is an integer number (2408000).

Almost surely, 2^16428644 is an apocalyptic number.

It is an amenable number.

16428644 is a deficient number, since it is larger than the sum of its proper divisors (12467356).

16428644 is a wasteful number, since it uses less digits than its factorization.

16428644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20842 (or 20840 counting only the distinct ones).

The product of its digits is 36864, while the sum is 35.

The square root of 16428644 is about 4053.2263692027. The cubic root of 16428644 is about 254.2146489841.

The spelling of 16428644 in words is "sixteen million, four hundred twenty-eight thousand, six hundred forty-four".