243640056 has 64 divisors (see below), whose sum is σ = 703572480. Its totient is φ = 69486080.

The previous prime is 243640031. The next prime is 243640069. The reversal of 243640056 is 650046342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22656 + ... + 31631.

It is an arithmetic number, because the mean of its divisors is an integer number (10993320).

Almost surely, 2^243640056 is an apocalyptic number.

It is an amenable number.

243640056 is an abundant number, since it is smaller than the sum of its proper divisors (459932424).

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

243640056 is a wasteful number, since it uses less digits than its factorization.

243640056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54324 (or 54320 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 243640056 is about 15608.9735729163. The cubic root of 243640056 is about 624.5725555193.

Adding to 243640056 its reverse (650046342), we get a palindrome (893686398).

The spelling of 243640056 in words is "two hundred forty-three million, six hundred forty thousand, fifty-six".