243443516420 has 72 divisors (see below), whose sum is σ = 555582540744. Its totient is φ = 89561991168.

The previous prime is 243443516417. The next prime is 243443516479. The reversal of 243443516420 is 24615344342.

It can be written as a sum of positive squares in 12 ways, for example, as 205711230916 + 37732285504 = 453554^2 + 194248^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 806252 + ... + 1066268.

It is an arithmetic number, because the mean of its divisors is an integer number (7716424177).

Almost surely, 2^243443516420 is an apocalyptic number.

243443516420 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 243443516420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277791270372).

243443516420 is an abundant number, since it is smaller than the sum of its proper divisors (312139024324).

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

243443516420 is a wasteful number, since it uses less digits than its factorization.

243443516420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260329 (or 260314 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 38.

The spelling of 243443516420 in words is "two hundred forty-three billion, four hundred forty-three million, five hundred sixteen thousand, four hundred twenty".