243910809840 has 80 divisors (see below), whose sum is σ = 780514615296. Its totient is φ = 62944723200.

The previous prime is 243910809829. The next prime is 243910809859. The reversal of 243910809840 is 48908019342.

243910809840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 243910809840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16384416 + ... + 16399295.

Almost surely, 2^243910809840 is an apocalyptic number.

243910809840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243910809840 is an abundant number, since it is smaller than the sum of its proper divisors (536603805456).

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

243910809840 is a wasteful number, since it uses less digits than its factorization.

243910809840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32783758 (or 32783752 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 243910809840 in words is "two hundred forty-three billion, nine hundred ten million, eight hundred nine thousand, eight hundred forty".