243138568 has 16 divisors (see below), whose sum is σ = 456683580. Its totient is φ = 121356288.

The previous prime is 243138563. The next prime is 243138617. The reversal of 243138568 is 865831342.

It can be written as a sum of positive squares in 2 ways, for example, as 220879044 + 22259524 = 14862^2 + 4718^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243138568.

It is not an unprimeable number, because it can be changed into a prime (243138563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21721 + ... + 30952.

Almost surely, 2^243138568 is an apocalyptic number.

It is an amenable number.

243138568 is a deficient number, since it is larger than the sum of its proper divisors (213545012).

243138568 is a wasteful number, since it uses less digits than its factorization.

243138568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53256 (or 53252 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 243138568 is about 15592.9012053562. The cubic root of 243138568 is about 624.1437388025.

The spelling of 243138568 in words is "two hundred forty-three million, one hundred thirty-eight thousand, five hundred sixty-eight".