243542320 has 80 divisors (see below), whose sum is σ = 656886528. Its totient is φ = 82241280.

The previous prime is 243542311. The next prime is 243542353. The reversal of 243542320 is 23245342.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×243542320³ (a number of 26 digits) contains 333 as substring.

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, 34275 + ... + 40765.

Almost surely, 2^243542320 is an apocalyptic number.

243542320 is a gapful number since it is divisible by the number (20) 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 243542320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328443264).

243542320 is an abundant number, since it is smaller than the sum of its proper divisors (413344208).

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

243542320 is a wasteful number, since it uses less digits than its factorization.

243542320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6578 (or 6572 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 25.

The square root of 243542320 is about 15605.8424956809. The cubic root of 243542320 is about 624.4890287673.

Adding to 243542320 its reverse (23245342), we get a palindrome (266787662).

The spelling of 243542320 in words is "two hundred forty-three million, five hundred forty-two thousand, three hundred twenty".