243423440728 has 128 divisors (see below), whose sum is σ = 502170439680. Its totient is φ = 109952017920.

The previous prime is 243423440723. The next prime is 243423440773. The reversal of 243423440728 is 827044324342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243423440723) 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, 432368175 + ... + 432368737.

It is an arithmetic number, because the mean of its divisors is an integer number (3923206560).

Almost surely, 2^243423440728 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 243423440728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251085219840).

243423440728 is an abundant number, since it is smaller than the sum of its proper divisors (258746998952).

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

243423440728 is a wasteful number, since it uses less digits than its factorization.

243423440728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089 (or 1085 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 43.

The spelling of 243423440728 in words is "two hundred forty-three billion, four hundred twenty-three million, four hundred forty thousand, seven hundred twenty-eight".