9789779878 has 8 divisors (see below), whose sum is σ = 14689726560. Its totient is φ = 4893204360.

The previous prime is 9789779843. The next prime is 9789779891. The reversal of 9789779878 is 8789779879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 9789779798 and 9789779807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835518 + ... + 847153.

It is an arithmetic number, because the mean of its divisors is an integer number (1836215820).

Almost surely, 2^9789779878 is an apocalyptic number.

9789779878 is a deficient number, since it is larger than the sum of its proper divisors (4899946682).

9789779878 is a wasteful number, since it uses less digits than its factorization.

9789779878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685582.

The product of its digits is 896168448, while the sum is 79.

The square root of 9789779878 is about 98943.3164897963. The cubic root of 9789779878 is about 2139.2307974435.

Subtracting from 9789779878 its reverse (8789779879), we obtain a palindrome (999999999).

The spelling of 9789779878 in words is "nine billion, seven hundred eighty-nine million, seven hundred seventy-nine thousand, eight hundred seventy-eight".