243664836 has 24 divisors (see below), whose sum is σ = 586892544. Its totient is φ = 78601440.

The previous prime is 243664831. The next prime is 243664849. The reversal of 243664836 is 638466342.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (243664831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327135 + ... + 327878.

It is an arithmetic number, because the mean of its divisors is an integer number (24453856).

Almost surely, 2^243664836 is an apocalyptic number.

It is an amenable number.

243664836 is an abundant number, since it is smaller than the sum of its proper divisors (343227708).

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

243664836 is a wasteful number, since it uses less digits than its factorization.

243664836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655051 (or 655049 counting only the distinct ones).

The product of its digits is 497664, while the sum is 42.

The square root of 243664836 is about 15609.7673269014. The cubic root of 243664836 is about 624.5937293545.

The spelling of 243664836 in words is "two hundred forty-three million, six hundred sixty-four thousand, eight hundred thirty-six".