243621303540 has 24 divisors (see below), whose sum is σ = 682139650080. Its totient is φ = 64965680928.

The previous prime is 243621303529. The next prime is 243621303617. The reversal of 243621303540 is 45303126342.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2030177470 + ... + 2030177589.

It is an arithmetic number, because the mean of its divisors is an integer number (28422485420).

Almost surely, 2^243621303540 is an apocalyptic number.

243621303540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243621303540 is an abundant number, since it is smaller than the sum of its proper divisors (438518346540).

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

243621303540 is a wasteful number, since it uses less digits than its factorization.

243621303540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060355071 (or 4060355069 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 33.

Adding to 243621303540 its reverse (45303126342), we get a palindrome (288924429882).

The spelling of 243621303540 in words is "two hundred forty-three billion, six hundred twenty-one million, three hundred three thousand, five hundred forty".