8117718378 has 192 divisors, whose sum is σ = 21334233600. Its totient is φ = 2034668160.

The previous prime is 8117718377. The next prime is 8117718379. The reversal of 8117718378 is 8738177118.

It is an interprime number because it is at equal distance from previous prime (8117718377) and next prime (8117718379).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8117718378.

It is not an unprimeable number, because it can be changed into a prime (8117718377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21418593 + ... + 21418971.

It is an arithmetic number, because the mean of its divisors is an integer number (111115800).

Almost surely, 2^8117718378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8117718378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10667116800).

8117718378 is an abundant number, since it is smaller than the sum of its proper divisors (13216515222).

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

8117718378 is a wasteful number, since it uses less digits than its factorization.

8117718378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 618 counting only the distinct ones).

The product of its digits is 526848, while the sum is 51.

The square root of 8117718378 is about 90098.3816613817. The cubic root of 8117718378 is about 2009.7621376406.

The spelling of 8117718378 in words is "eight billion, one hundred seventeen million, seven hundred eighteen thousand, three hundred seventy-eight".