16668216 has 24 divisors (see below), whose sum is σ = 45143280. Its totient is φ = 5556048.

The previous prime is 16668209. The next prime is 16668229. The reversal of 16668216 is 61286661.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115680 + ... + 115823.

It is an arithmetic number, because the mean of its divisors is an integer number (1880970).

Almost surely, 2^16668216 is an apocalyptic number.

It is an amenable number.

16668216 is an abundant number, since it is smaller than the sum of its proper divisors (28475064).

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

16668216 is a wasteful number, since it uses less digits than its factorization.

16668216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231515 (or 231508 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 16668216 is about 4082.6726540344. The cubic root of 16668216 is about 255.4443923442. Note that the first 3 decimals are identical.

The spelling of 16668216 in words is "sixteen million, six hundred sixty-eight thousand, two hundred sixteen".