243668840 has 32 divisors (see below), whose sum is σ = 549839880. Its totient is φ = 97185792.

The previous prime is 243668819. The next prime is 243668857. The reversal of 243668840 is 48866342.

It can be written as a sum of positive squares in 4 ways, for example, as 115390564 + 128278276 = 10742^2 + 11326^2 .

It is an unprimeable number.

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, 5492 + ... + 22748.

Almost surely, 2^243668840 is an apocalyptic number.

243668840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243668840 is an abundant number, since it is smaller than the sum of its proper divisors (306171040).

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

243668840 is a wasteful number, since it uses less digits than its factorization.

243668840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17621 (or 17617 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 41.

The square root of 243668840 is about 15609.8955794073. The cubic root of 243668840 is about 624.5971505288.

The spelling of 243668840 in words is "two hundred forty-three million, six hundred sixty-eight thousand, eight hundred forty".