216323316 has 108 divisors (see below), whose sum is σ = 613041156. Its totient is φ = 64247040.

The previous prime is 216323299. The next prime is 216323321. The reversal of 216323316 is 613323612.

It is a happy number.

216323316 is a `hidden beast` number, since 21 + 6 + 323 + 316 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 73616400 + 142706916 = 8580^2 + 11946^2 .

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 216323316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 230400 + ... + 231336.

It is an arithmetic number, because the mean of its divisors is an integer number (5676307).

Almost surely, 2^216323316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216323316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306520578).

216323316 is an abundant number, since it is smaller than the sum of its proper divisors (396717840).

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

216323316 is a wasteful number, since it uses less digits than its factorization.

216323316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022 (or 1006 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 216323316 is about 14707.9337773870. The cubic root of 216323316 is about 600.2992174234.

Adding to 216323316 its reverse (613323612), we get a palindrome (829646928).

The spelling of 216323316 in words is "two hundred sixteen million, three hundred twenty-three thousand, three hundred sixteen".