9878778 has 96 divisors (see below), whose sum is σ = 27221376. Its totient is φ = 2519424.

The previous prime is 9878773. The next prime is 9878797. The reversal of 9878778 is 8778789.

It is not an unprimeable number, because it can be changed into a prime (9878773) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60525 + ... + 60687.

It is an arithmetic number, because the mean of its divisors is an integer number (283556).

Almost surely, 2^9878778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9878778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13610688).

9878778 is an abundant number, since it is smaller than the sum of its proper divisors (17342598).

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

9878778 is a wasteful number, since it uses less digits than its factorization.

9878778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 225 counting only the distinct ones).

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

The square root of 9878778 is about 3143.0523380943. The cubic root of 9878778 is about 214.5693778547.

The spelling of 9878778 in words is "nine million, eight hundred seventy-eight thousand, seven hundred seventy-eight".