243064135640 has 64 divisors (see below), whose sum is σ = 555208162560. Its totient is φ = 95748428160.

The previous prime is 243064135603. The next prime is 243064135687. The reversal of 243064135640 is 46531460342.

It is a junction number, because it is equal to n+sod(n) for n = 243064135594 and 243064135603.

It is a congruent number.

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, 12004325 + ... + 12024555.

It is an arithmetic number, because the mean of its divisors is an integer number (8675127540).

Almost surely, 2^243064135640 is an apocalyptic number.

243064135640 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 243064135640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277604081280).

243064135640 is an abundant number, since it is smaller than the sum of its proper divisors (312144026920).

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

243064135640 is a wasteful number, since it uses less digits than its factorization.

243064135640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24792 (or 24788 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 38.

Adding to 243064135640 its reverse (46531460342), we get a palindrome (289595595982).

The spelling of 243064135640 in words is "two hundred forty-three billion, sixty-four million, one hundred thirty-five thousand, six hundred forty".