16644004 has 24 divisors (see below), whose sum is σ = 31494848. Its totient is φ = 7650720.

The previous prime is 16643989. The next prime is 16644011. The reversal of 16644004 is 40044661.

It is a self number, because there is not a number n which added to its sum of digits gives 16644004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16729 + ... + 17695.

Almost surely, 2^16644004 is an apocalyptic number.

It is an amenable number.

16644004 is a deficient number, since it is larger than the sum of its proper divisors (14850844).

16644004 is a wasteful number, since it uses less digits than its factorization.

16644004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315 (or 1313 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 16644004 is about 4079.7063619824. The cubic root of 16644004 is about 255.3206475135.

Adding to 16644004 its reverse (40044661), we get a palindrome (56688665).

The spelling of 16644004 in words is "sixteen million, six hundred forty-four thousand, four".