243644240420 has 96 divisors (see below), whose sum is σ = 604171685376. Its totient is φ = 80804505600.

The previous prime is 243644240419. The next prime is 243644240453. The reversal of 243644240420 is 24042446342.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295580 + ... + 758060.

It is an arithmetic number, because the mean of its divisors is an integer number (6293455056).

Almost surely, 2^243644240420 is an apocalyptic number.

243644240420 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 243644240420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302085842688).

243644240420 is an abundant number, since it is smaller than the sum of its proper divisors (360527444956).

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

243644240420 is a wasteful number, since it uses less digits than its factorization.

243644240420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462621 (or 462619 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 35.

Adding to 243644240420 its reverse (24042446342), we get a palindrome (267686686762).

The spelling of 243644240420 in words is "two hundred forty-three billion, six hundred forty-four million, two hundred forty thousand, four hundred twenty".