16623216 has 60 divisors (see below), whose sum is σ = 46812480. Its totient is φ = 5506560.

The previous prime is 16623209. The next prime is 16623247. The reversal of 16623216 is 61232661.

16623216 is a `hidden beast` number, since 16 + 623 + 21 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 16623216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34465 + ... + 34943.

It is an arithmetic number, because the mean of its divisors is an integer number (780208).

Almost surely, 2^16623216 is an apocalyptic number.

16623216 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 16623216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23406240).

16623216 is an abundant number, since it is smaller than the sum of its proper divisors (30189264).

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

16623216 is a wasteful number, since it uses less digits than its factorization.

16623216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734 (or 725 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 16623216 is about 4077.1578335895. The cubic root of 16623216 is about 255.2143065783.

Adding to 16623216 its reverse (61232661), we get a palindrome (77855877).

The spelling of 16623216 in words is "sixteen million, six hundred twenty-three thousand, two hundred sixteen".