16601216 has 32 divisors (see below), whose sum is σ = 34516800. Its totient is φ = 7938304.

The previous prime is 16601209. The next prime is 16601227. The reversal of 16601216 is 61210661.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 16601191 and 16601200.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125 + ... + 5763.

It is an arithmetic number, because the mean of its divisors is an integer number (1078650).

Almost surely, 2^16601216 is an apocalyptic number.

16601216 is a gapful number since it is divisible by the number (16) 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 16601216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17258400).

16601216 is an abundant number, since it is smaller than the sum of its proper divisors (17915584).

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

16601216 is an equidigital number, since it uses as much as digits as its factorization.

16601216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5676 (or 5664 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 16601216 is about 4074.4589824908. The cubic root of 16601216 is about 255.1016690578.

Adding to 16601216 its reverse (61210661), we get a palindrome (77811877).

The spelling of 16601216 in words is "sixteen million, six hundred one thousand, two hundred sixteen".