16644006 has 48 divisors (see below), whose sum is σ = 37690224. Its totient is φ = 5303232.

The previous prime is 16643989. The next prime is 16644011. The reversal of 16644006 is 60044661.

16644006 is a `hidden beast` number, since 16 + 644 + 0 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44436 + ... + 44808.

It is an arithmetic number, because the mean of its divisors is an integer number (785213).

Almost surely, 2^16644006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16644006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18845112).

16644006 is an abundant number, since it is smaller than the sum of its proper divisors (21046218).

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

16644006 is a wasteful number, since it uses less digits than its factorization.

16644006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 16644006 is about 4079.7066070981. The cubic root of 16644006 is about 255.3206577402.

Adding to 16644006 its reverse (60044661), we get a palindrome (76688667).

The spelling of 16644006 in words is "sixteen million, six hundred forty-four thousand, six".