16604 has 12 divisors (see below), whose sum is σ = 33264. Its totient is φ = 7104.

The previous prime is 16603. The next prime is 16607. The reversal of 16604 is 40661.

16604 = 42² + 43² + ... + 49².

16604 is an admirable number.

It is a plaindrome in base 9.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269 + ... + 324.

It is an arithmetic number, because the mean of its divisors is an integer number (2772).

2¹⁶⁶⁰⁴ is an apocalyptic number.

16604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16632).

16604 is a wasteful number, since it uses less digits than its factorization.

16604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 16604 is about 128.8565093428. The cubic root of 16604 is about 25.5115928322.

The spelling of 16604 in words is "sixteen thousand, six hundred four".