9787878 has 40 divisors (see below), whose sum is σ = 22651200. Its totient is φ = 3155760.

The previous prime is 9787871. The next prime is 9787879. The reversal of 9787878 is 8787879.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9787871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4048 + ... + 5996.

It is an arithmetic number, because the mean of its divisors is an integer number (566280).

Almost surely, 2^9787878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9787878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11325600).

9787878 is an abundant number, since it is smaller than the sum of its proper divisors (12863322).

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

9787878 is a wasteful number, since it uses less digits than its factorization.

9787878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994 (or 1985 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 54.

The square root of 9787878 is about 3128.5584539848. The cubic root of 9787878 is about 213.9092257744.

Subtracting from 9787878 its reverse (8787879), we obtain a palindrome (999999).

The spelling of 9787878 in words is "nine million, seven hundred eighty-seven thousand, eight hundred seventy-eight".