243310386820 has 12 divisors (see below), whose sum is σ = 510951812364. Its totient is φ = 97324154720.

The previous prime is 243310386731. The next prime is 243310386829. The reversal of 243310386820 is 28683013342.

It can be written as a sum of positive squares in 2 ways, for example, as 76042474564 + 167267912256 = 275758^2 + 408984^2 .

It is not an unprimeable number, because it can be changed into a prime (243310386829) 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, 6082759651 + ... + 6082759690.

It is an arithmetic number, because the mean of its divisors is an integer number (42579317697).

Almost surely, 2^243310386820 is an apocalyptic number.

243310386820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243310386820 is an abundant number, since it is smaller than the sum of its proper divisors (267641425544).

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

243310386820 is a wasteful number, since it uses less digits than its factorization.

243310386820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12165519350 (or 12165519348 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 243310386820 in words is "two hundred forty-three billion, three hundred ten million, three hundred eighty-six thousand, eight hundred twenty".