16604240 has 80 divisors (see below), whose sum is σ = 42385680. Its totient is φ = 6021120.

The previous prime is 16604239. The next prime is 16604243. The reversal of 16604240 is 4240661.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1175056 + 15429184 = 1084^2 + 3928^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16604243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39230 + ... + 39650.

It is an arithmetic number, because the mean of its divisors is an integer number (529821).

Almost surely, 2^16604240 is an apocalyptic number.

16604240 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 16604240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21192840).

16604240 is an abundant number, since it is smaller than the sum of its proper divisors (25781440).

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

16604240 is a wasteful number, since it uses less digits than its factorization.

16604240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 16604240 is about 4074.8300578061. The cubic root of 16604240 is about 255.1171574938.

The spelling of 16604240 in words is "sixteen million, six hundred four thousand, two hundred forty".