16644336 has 40 divisors (see below), whose sum is σ = 43342464. Its totient is φ = 5503680.

The previous prime is 16644301. The next prime is 16644337. The reversal of 16644336 is 63344661.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 16644297 and 16644306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16644337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4965 + ... + 7611.

Almost surely, 2^16644336 is an apocalyptic number.

16644336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16644336 is an abundant number, since it is smaller than the sum of its proper divisors (26698128).

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

16644336 is a wasteful number, since it uses less digits than its factorization.

16644336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789 (or 2783 counting only the distinct ones).

The product of its digits is 31104, while the sum is 33.

The square root of 16644336 is about 4079.7470509825. The cubic root of 16644336 is about 255.3223451397.

Adding to 16644336 its reverse (63344661), we get a palindrome (79988997).

The spelling of 16644336 in words is "sixteen million, six hundred forty-four thousand, three hundred thirty-six".