243638695368 has 96 divisors (see below), whose sum is σ = 688653288960. Its totient is φ = 80695517760.

The previous prime is 243638695361. The next prime is 243638695369. The reversal of 243638695368 is 863596836342.

243638695368 is a `hidden beast` number, since 2 + 4 + 3 + 6 + 38 + 69 + 536 + 8 = 666.

It is a super-2 number, since 2×243638695368² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243638695361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93928 + ... + 704343.

It is an arithmetic number, because the mean of its divisors is an integer number (7173471760).

Almost surely, 2^243638695368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243638695368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (344326644480).

243638695368 is an abundant number, since it is smaller than the sum of its proper divisors (445014593592).

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

243638695368 is a wasteful number, since it uses less digits than its factorization.

243638695368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798449 (or 798433 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 63.

The spelling of 243638695368 in words is "two hundred forty-three billion, six hundred thirty-eight million, six hundred ninety-five thousand, three hundred sixty-eight".