16645072 has 30 divisors (see below), whose sum is σ = 33427238. Its totient is φ = 8029056.

The previous prime is 16645061. The next prime is 16645081. The reversal of 16645072 is 27054661.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4562496 + 12082576 = 2136^2 + 3476^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12838 + ... + 14074.

Almost surely, 2^16645072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16645072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16713619).

16645072 is an abundant number, since it is smaller than the sum of its proper divisors (16782166).

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

16645072 is a wasteful number, since it uses less digits than its factorization.

16645072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303 (or 1268 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 16645072 is about 4079.8372516560. The cubic root of 16645072 is about 255.3261084714.

The spelling of 16645072 in words is "sixteen million, six hundred forty-five thousand, seventy-two".