243216636 has 48 divisors (see below), whose sum is σ = 617498784. Its totient is φ = 74059776.

The previous prime is 243216601. The next prime is 243216641. The reversal of 243216636 is 636612342.

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

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 243216597 and 243216606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7096 + ... + 23168.

It is an arithmetic number, because the mean of its divisors is an integer number (12864558).

Almost surely, 2^243216636 is an apocalyptic number.

243216636 is a gapful number since it is divisible by the number (26) 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 243216636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308749392).

243216636 is an abundant number, since it is smaller than the sum of its proper divisors (374282148).

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

243216636 is a wasteful number, since it uses less digits than its factorization.

243216636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16190 (or 16188 counting only the distinct ones).

The product of its digits is 31104, while the sum is 33.

The square root of 243216636 is about 15595.4043230690. The cubic root of 243216636 is about 624.2105325925.

Adding to 243216636 its reverse (636612342), we get a palindrome (879828978).

The spelling of 243216636 in words is "two hundred forty-three million, two hundred sixteen thousand, six hundred thirty-six".