16644120 has 64 divisors (see below), whose sum is σ = 50893920. Its totient is φ = 4353024.

The previous prime is 16644119. The next prime is 16644137. The reversal of 16644120 is 2144661.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5052 + ... + 7668.

Almost surely, 2^16644120 is an apocalyptic number.

16644120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16644120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25446960).

16644120 is an abundant number, since it is smaller than the sum of its proper divisors (34249800).

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

16644120 is a wasteful number, since it uses less digits than its factorization.

16644120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684 (or 2680 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 16644120 is about 4079.7205786671. The cubic root of 16644120 is about 255.3212406625.

Adding to 16644120 its reverse (2144661), we get a palindrome (18788781).

The spelling of 16644120 in words is "sixteen million, six hundred forty-four thousand, one hundred twenty".