243516640 has 48 divisors (see below), whose sum is σ = 600330528. Its totient is φ = 93170176.

The previous prime is 243516613. The next prime is 243516641. The reversal of 243516640 is 46615342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243516641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29407 + ... + 36766.

It is an arithmetic number, because the mean of its divisors is an integer number (12506886).

Almost surely, 2^243516640 is an apocalyptic number.

243516640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243516640 is an abundant number, since it is smaller than the sum of its proper divisors (356813888).

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

243516640 is a wasteful number, since it uses less digits than its factorization.

243516640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66211 (or 66203 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 243516640 is about 15605.0197052102. The cubic root of 243516640 is about 624.4670785207.

The spelling of 243516640 in words is "two hundred forty-three million, five hundred sixteen thousand, six hundred forty".