8242643878 has 48 divisors (see below), whose sum is σ = 15628032000. Its totient is φ = 3238658640.

The previous prime is 8242643861. The next prime is 8242643881. The reversal of 8242643878 is 8783462428.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13678 + ... + 129121.

It is an arithmetic number, because the mean of its divisors is an integer number (325584000).

Almost surely, 2^8242643878 is an apocalyptic number.

8242643878 is a deficient number, since it is larger than the sum of its proper divisors (7385388122).

8242643878 is a wasteful number, since it uses less digits than its factorization.

8242643878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142865 (or 142858 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 52.

The square root of 8242643878 is about 90789.0074733720. The cubic root of 8242643878 is about 2020.0192690055.

The spelling of 8242643878 in words is "eight billion, two hundred forty-two million, six hundred forty-three thousand, eight hundred seventy-eight".