16644424 has 32 divisors (see below), whose sum is σ = 32016600. Its totient is φ = 8110080.

The previous prime is 16644403. The next prime is 16644443. The reversal of 16644424 is 42444661.

It can be written as a sum of positive squares in 4 ways, for example, as 13468900 + 3175524 = 3670^2 + 1782^2 .

It is a super-3 number, since 3×16644424³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

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, 68944 + ... + 69184.

Almost surely, 2^16644424 is an apocalyptic number.

It is an amenable number.

16644424 is a deficient number, since it is larger than the sum of its proper divisors (15372176).

16644424 is a wasteful number, since it uses less digits than its factorization.

16644424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 429 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 16644424 is about 4079.7578359506. The cubic root of 16644424 is about 255.3227951091.

The spelling of 16644424 in words is "sixteen million, six hundred forty-four thousand, four hundred twenty-four".