8718691878 has 128 divisors (see below), whose sum is σ = 21168000000. Its totient is φ = 2644088832.

The previous prime is 8718691819. The next prime is 8718691907. The reversal of 8718691878 is 8781968178.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19417798 + ... + 19418246.

It is an arithmetic number, because the mean of its divisors is an integer number (165375000).

Almost surely, 2^8718691878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8718691878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10584000000).

8718691878 is an abundant number, since it is smaller than the sum of its proper divisors (12449308122).

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

8718691878 is a wasteful number, since it uses less digits than its factorization.

8718691878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 805 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 63.

The square root of 8718691878 is about 93373.9357529712. The cubic root of 8718691878 is about 2058.1820041502.

The spelling of 8718691878 in words is "eight billion, seven hundred eighteen million, six hundred ninety-one thousand, eight hundred seventy-eight".