16865664 has 64 divisors (see below), whose sum is σ = 45239040. Its totient is φ = 5566976.

The previous prime is 16865663. The next prime is 16865669. The reversal of 16865664 is 46656861.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16865663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63997 + ... + 64259.

It is an arithmetic number, because the mean of its divisors is an integer number (706860).

Almost surely, 2^16865664 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 16865664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22619520).

16865664 is an abundant number, since it is smaller than the sum of its proper divisors (28373376).

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

16865664 is a wasteful number, since it uses less digits than its factorization.

16865664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 435 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 16865664 is about 4106.7826823439. The cubic root of 16865664 is about 256.4490815411.

The spelling of 16865664 in words is "sixteen million, eight hundred sixty-five thousand, six hundred sixty-four".