243685780 has 24 divisors (see below), whose sum is σ = 551105352. Its totient is φ = 89976192.

The previous prime is 243685777. The next prime is 243685781. The reversal of 243685780 is 87586342.

It can be written as a sum of positive squares in 4 ways, for example, as 7817616 + 235868164 = 2796^2 + 15358^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243685781) 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 in 7 ways as a sum of consecutive naturals, for example, 468367 + ... + 468886.

It is an arithmetic number, because the mean of its divisors is an integer number (22962723).

Almost surely, 2^243685780 is an apocalyptic number.

243685780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243685780 is an abundant number, since it is smaller than the sum of its proper divisors (307419572).

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

243685780 is a wasteful number, since it uses less digits than its factorization.

243685780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937275 (or 937273 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The square root of 243685780 is about 15610.4381745036. The cubic root of 243685780 is about 624.6116243129.

The spelling of 243685780 in words is "two hundred forty-three million, six hundred eighty-five thousand, seven hundred eighty".