243723121280 has 128 divisors (see below), whose sum is σ = 585250997760. Its totient is φ = 97055334400.

The previous prime is 243723121273. The next prime is 243723121339. The reversal of 243723121280 is 82121327342.

243723121280 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 243723121280.

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, 236394365 + ... + 236395395.

It is an arithmetic number, because the mean of its divisors is an integer number (4572273420).

Almost surely, 2^243723121280 is an apocalyptic number.

243723121280 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 243723121280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292625498880).

243723121280 is an abundant number, since it is smaller than the sum of its proper divisors (341527876480).

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

243723121280 is a wasteful number, since it uses less digits than its factorization.

243723121280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338 (or 2326 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The spelling of 243723121280 in words is "two hundred forty-three billion, seven hundred twenty-three million, one hundred twenty-one thousand, two hundred eighty".