16643328 has 72 divisors (see below), whose sum is σ = 47731488. Its totient is φ = 5117952.

The previous prime is 16643309. The next prime is 16643339. The reversal of 16643328 is 82334661.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9151 + ... + 10817.

Almost surely, 2^16643328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16643328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23865744).

16643328 is an abundant number, since it is smaller than the sum of its proper divisors (31088160).

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

16643328 is a wasteful number, since it uses less digits than its factorization.

16643328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699 (or 1685 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 16643328 is about 4079.6235120413. The cubic root of 16643328 is about 255.3171908313.

Adding to 16643328 its reverse (82334661), we get a palindrome (98977989).

The spelling of 16643328 in words is "sixteen million, six hundred forty-three thousand, three hundred twenty-eight".