9878989878 has 40 divisors (see below), whose sum is σ = 22607256672. Its totient is φ = 3222930384.

The previous prime is 9878989873. The next prime is 9878989891. The reversal of 9878989878 is 8789898789.

9878989878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

9878989878 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9878989797 and 9878989806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9878989873) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 641125 + ... + 656352.

Almost surely, 2^9878989878 is an apocalyptic number.

9878989878 is an abundant number, since it is smaller than the sum of its proper divisors (12728266794).

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

9878989878 is a wasteful number, since it uses less digits than its factorization.

9878989878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297538 (or 1297529 counting only the distinct ones).

The product of its digits is 1170505728, while the sum is 81.

The square root of 9878989878 is about 99393.1077992835. The cubic root of 9878989878 is about 2145.7091185703.

The spelling of 9878989878 in words is "nine billion, eight hundred seventy-eight million, nine hundred eighty-nine thousand, eight hundred seventy-eight".