7938679866 has 64 divisors (see below), whose sum is σ = 17575100928. Its totient is φ = 2375126208.

The previous prime is 7938679843. The next prime is 7938679867. The reversal of 7938679866 is 6689768397.

It is a self number, because there is not a number n which added to its sum of digits gives 7938679866.

It is not an unprimeable number, because it can be changed into a prime (7938679867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 756145 + ... + 766571.

It is an arithmetic number, because the mean of its divisors is an integer number (274610952).

Almost surely, 2^7938679866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7938679866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8787550464).

7938679866 is an abundant number, since it is smaller than the sum of its proper divisors (9636421062).

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

7938679866 is a wasteful number, since it uses less digits than its factorization.

7938679866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10715.

The product of its digits is 164602368, while the sum is 69.

The square root of 7938679866 is about 89099.2697276470. The cubic root of 7938679866 is about 1994.8768768432.

The spelling of 7938679866 in words is "seven billion, nine hundred thirty-eight million, six hundred seventy-nine thousand, eight hundred sixty-six".