16643684 has 12 divisors (see below), whose sum is σ = 29160684. Its totient is φ = 8312064.

The previous prime is 16643659. The next prime is 16643707. The reversal of 16643684 is 48634661.

It can be written as a sum of positive squares in 2 ways, for example, as 3841600 + 12802084 = 1960^2 + 3578^2 .

It is a congruent number.

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, 2492 + ... + 6284.

It is an arithmetic number, because the mean of its divisors is an integer number (2430057).

Almost surely, 2^16643684 is an apocalyptic number.

It is an amenable number.

16643684 is a deficient number, since it is larger than the sum of its proper divisors (12517000).

16643684 is a wasteful number, since it uses less digits than its factorization.

16643684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4894 (or 4892 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 16643684 is about 4079.6671432851. The cubic root of 16643684 is about 255.3190112259.

The spelling of 16643684 in words is "sixteen million, six hundred forty-three thousand, six hundred eighty-four".