243253520 has 80 divisors (see below), whose sum is σ = 598568832. Its totient is φ = 91745280.

The previous prime is 243253513. The next prime is 243253531. The reversal of 243253520 is 25352342.

243253520 is digitally balanced in base 2, 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 (80).

It is a self number, because there is not a number n which added to its sum of digits gives 243253520.

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, 133415 + ... + 135225.

Almost surely, 2^243253520 is an apocalyptic number.

243253520 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 243253520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299284416).

243253520 is an abundant number, since it is smaller than the sum of its proper divisors (355315312).

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

243253520 is a wasteful number, since it uses less digits than its factorization.

243253520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920 (or 1914 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 243253520 is about 15596.5868060932. The cubic root of 243253520 is about 624.2420850086.

The spelling of 243253520 in words is "two hundred forty-three million, two hundred fifty-three thousand, five hundred twenty".