243081216 has 224 divisors, whose sum is σ = 828324480. Its totient is φ = 69009408.

The previous prime is 243081197. The next prime is 243081233. The reversal of 243081216 is 612180342.

243081216 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 243081216.

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, 1548210 + ... + 1548366.

Almost surely, 2^243081216 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 243081216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (414162240).

243081216 is an abundant number, since it is smaller than the sum of its proper divisors (585243264).

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

243081216 is an equidigital number, since it uses as much as digits as its factorization.

243081216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 243081216 is about 15591.0620549083. The cubic root of 243081216 is about 624.0946601956.

The spelling of 243081216 in words is "two hundred forty-three million, eighty-one thousand, two hundred sixteen".