16644644 has 24 divisors (see below), whose sum is σ = 30240000. Its totient is φ = 8007840.

The previous prime is 16644629. The next prime is 16644671. The reversal of 16644644 is 44644661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33107 + ... + 33605.

It is an arithmetic number, because the mean of its divisors is an integer number (1260000).

Almost surely, 2^16644644 is an apocalyptic number.

It is an amenable number.

16644644 is a deficient number, since it is larger than the sum of its proper divisors (13595356).

16644644 is a wasteful number, since it uses less digits than its factorization.

16644644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803 (or 801 counting only the distinct ones).

The product of its digits is 55296, while the sum is 35.

The square root of 16644644 is about 4079.7847982461. The cubic root of 16644644 is about 255.3239200257.

The spelling of 16644644 in words is "sixteen million, six hundred forty-four thousand, six hundred forty-four".