243724415640 has 128 divisors (see below), whose sum is σ = 745599038400. Its totient is φ = 63712962560.

The previous prime is 243724415563. The next prime is 243724415647. The reversal of 243724415640 is 46514427342.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 243724415592 and 243724415601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243724415647) 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, 7800850 + ... + 7832030.

Almost surely, 2^243724415640 is an apocalyptic number.

243724415640 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 243724415640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (372799519200).

243724415640 is an abundant number, since it is smaller than the sum of its proper divisors (501874622760).

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

243724415640 is a wasteful number, since it uses less digits than its factorization.

243724415640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32477 (or 32473 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 42.

The spelling of 243724415640 in words is "two hundred forty-three billion, seven hundred twenty-four million, four hundred fifteen thousand, six hundred forty".