216669444 has 12 divisors (see below), whose sum is σ = 505562064. Its totient is φ = 72223144.

The previous prime is 216669443. The next prime is 216669449. The reversal of 216669444 is 444966612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 216669396 and 216669405.

It is not an unprimeable number, because it can be changed into a prime (216669443) 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, 9027882 + ... + 9027905.

It is an arithmetic number, because the mean of its divisors is an integer number (42130172).

Almost surely, 2^216669444 is an apocalyptic number.

It is an amenable number.

216669444 is an abundant number, since it is smaller than the sum of its proper divisors (288892620).

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

216669444 is a wasteful number, since it uses less digits than its factorization.

216669444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18055794 (or 18055792 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 216669444 is about 14719.6957848999. The cubic root of 216669444 is about 600.6192162877.

The spelling of 216669444 in words is "two hundred sixteen million, six hundred sixty-nine thousand, four hundred forty-four".