243664636 has 12 divisors (see below), whose sum is σ = 426538728. Its totient is φ = 121796432.

The previous prime is 243664633. The next prime is 243664649. The reversal of 243664636 is 636466342.

243664636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243664633) 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, 11490 + ... + 24886.

It is an arithmetic number, because the mean of its divisors is an integer number (35544894).

Almost surely, 2^243664636 is an apocalyptic number.

It is an amenable number.

243664636 is a deficient number, since it is larger than the sum of its proper divisors (182874092).

243664636 is a wasteful number, since it uses less digits than its factorization.

243664636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17948 (or 17946 counting only the distinct ones).

The product of its digits is 373248, while the sum is 40.

The square root of 243664636 is about 15609.7609206547. The cubic root of 243664636 is about 624.5935584657.

The spelling of 243664636 in words is "two hundred forty-three million, six hundred sixty-four thousand, six hundred thirty-six".