243640016 has 10 divisors (see below), whose sum is σ = 472052562. Its totient is φ = 121820000.

The previous prime is 243640013. The next prime is 243640027. The reversal of 243640016 is 610046342.

It can be written as a sum of positive squares in only one way, i.e., 215972416 + 27667600 = 14696^2 + 5260^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243640013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7613735 + ... + 7613766.

Almost surely, 2^243640016 is an apocalyptic number.

It is an amenable number.

243640016 is a deficient number, since it is larger than the sum of its proper divisors (228412546).

243640016 is a wasteful number, since it uses less digits than its factorization.

243640016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15227509 (or 15227503 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 243640016 is about 15608.9722916020. The cubic root of 243640016 is about 624.5725213392.

Adding to 243640016 its reverse (610046342), we get a palindrome (853686358).

The spelling of 243640016 in words is "two hundred forty-three million, six hundred forty thousand, sixteen".