9915847878 has 16 divisors (see below), whose sum is σ = 19833716736. Its totient is φ = 3304945800.

The previous prime is 9915847867. The next prime is 9915847933. The reversal of 9915847878 is 8787485199.

9915847878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 16198 + ... + 141753.

It is an arithmetic number, because the mean of its divisors is an integer number (1239607296).

Almost surely, 2^9915847878 is an apocalyptic number.

9915847878 is an abundant number, since it is smaller than the sum of its proper divisors (9917868858).

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

9915847878 is a wasteful number, since it uses less digits than its factorization.

9915847878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168419.

The product of its digits is 40642560, while the sum is 66.

The square root of 9915847878 is about 99578.3504482777. The cubic root of 9915847878 is about 2148.3743166351.

The spelling of 9915847878 in words is "nine billion, nine hundred fifteen million, eight hundred forty-seven thousand, eight hundred seventy-eight".