243420354520 has 128 divisors (see below), whose sum is σ = 632653286400. Its totient is φ = 82564416000.

The previous prime is 243420354493. The next prime is 243420354523. The reversal of 243420354520 is 25453024342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243420354523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44425141 + ... + 44430619.

It is an arithmetic number, because the mean of its divisors is an integer number (4942603800).

Almost surely, 2^243420354520 is an apocalyptic number.

243420354520 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 243420354520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316326643200).

243420354520 is an abundant number, since it is smaller than the sum of its proper divisors (389232931880).

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

243420354520 is a wasteful number, since it uses less digits than its factorization.

243420354520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7169 (or 7165 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 34.

Adding to 243420354520 its reverse (25453024342), we get a palindrome (268873378862).

The spelling of 243420354520 in words is "two hundred forty-three billion, four hundred twenty million, three hundred fifty-four thousand, five hundred twenty".