243640828806 has 32 divisors (see below), whose sum is σ = 488290094208. Its totient is φ = 81045669120.

The previous prime is 243640828741. The next prime is 243640828819. The reversal of 243640828806 is 608828046342.

It is a happy number.

It is a super-2 number, since 2×243640828806² (a number of 24 digits) contains 22 as substring.

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, 8013325 + ... + 8043671.

It is an arithmetic number, because the mean of its divisors is an integer number (15259065444).

Almost surely, 2^243640828806 is an apocalyptic number.

243640828806 is an abundant number, since it is smaller than the sum of its proper divisors (244649265402).

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

243640828806 is a wasteful number, since it uses less digits than its factorization.

243640828806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33076.

The product of its (nonzero) digits is 3538944, while the sum is 51.

The spelling of 243640828806 in words is "two hundred forty-three billion, six hundred forty million, eight hundred twenty-eight thousand, eight hundred six".