243587640 has 128 divisors (see below), whose sum is σ = 752094720. Its totient is φ = 63091200.

The previous prime is 243587621. The next prime is 243587693. The reversal of 243587640 is 46785342.

It is a happy number.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 783085 + ... + 783395.

It is an arithmetic number, because the mean of its divisors is an integer number (5875740).

Almost surely, 2^243587640 is an apocalyptic number.

243587640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243587640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (376047360).

243587640 is an abundant number, since it is smaller than the sum of its proper divisors (508507080).

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

243587640 is a wasteful number, since it uses less digits than its factorization.

243587640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The square root of 243587640 is about 15607.2944484302. The cubic root of 243587640 is about 624.5277627437.

The spelling of 243587640 in words is "two hundred forty-three million, five hundred eighty-seven thousand, six hundred forty".