9878787879 has 16 divisors (see below), whose sum is σ = 13842314112. Its totient is φ = 6258839328.

The previous prime is 9878787869. The next prime is 9878787889. The reversal of 9878787879 is 9787878789.

9878787879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9878787869) and next prime (9878787889).

It is not a de Polignac number, because 9878787879 - 2⁸ = 9878787623 is a prime.

It is a super-3 number, since 3×9878787879³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9878787869) 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 15 ways as a sum of consecutive naturals, for example, 1030089 + ... + 1039634.

It is an arithmetic number, because the mean of its divisors is an integer number (865144632).

Almost surely, 2^9878787879 is an apocalyptic number.

9878787879 is a deficient number, since it is larger than the sum of its proper divisors (3963526233).

9878787879 is a wasteful number, since it uses less digits than its factorization.

9878787879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069806.

The product of its digits is 796594176, while the sum is 78.

The square root of 9878787879 is about 99392.0916320811. The cubic root of 9878787879 is about 2145.6944937940.

The spelling of 9878787879 in words is "nine billion, eight hundred seventy-eight million, seven hundred eighty-seven thousand, eight hundred seventy-nine".