243216256 has 32 divisors (see below), whose sum is σ = 495811800. Its totient is φ = 118777344.

The previous prime is 243216241. The next prime is 243216257. The reversal of 243216256 is 652612342.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243216257) 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, 16591 + ... + 27598.

Almost surely, 2^243216256 is an apocalyptic number.

It is an amenable number.

243216256 is an abundant number, since it is smaller than the sum of its proper divisors (252595544).

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

243216256 is an equidigital number, since it uses as much as digits as its factorization.

243216256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44246 (or 44234 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 243216256 is about 15595.3921399880. The cubic root of 243216256 is about 624.2102075049.

Adding to 243216256 its reverse (652612342), we get a palindrome (895828598).

The spelling of 243216256 in words is "two hundred forty-three million, two hundred sixteen thousand, two hundred fifty-six".