9789779880 has 96 divisors (see below), whose sum is σ = 32995216800. Its totient is φ = 2610605376.

The previous prime is 9789779843. The next prime is 9789779891. The reversal of 9789779880 is 889779879.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 9789779799 and 9789779808.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 493870 + ... + 513309.

It is an arithmetic number, because the mean of its divisors is an integer number (343700175).

Almost surely, 2^9789779880 is an apocalyptic number.

9789779880 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9789779880 is an abundant number, since it is smaller than the sum of its proper divisors (23205436920).

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

9789779880 is a wasteful number, since it uses less digits than its factorization.

9789779880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007205 (or 1007189 counting only the distinct ones).

The product of its (nonzero) digits is 128024064, while the sum is 72.

The square root of 9789779880 is about 98943.3164999031. The cubic root of 9789779880 is about 2139.2307975892.

The spelling of 9789779880 in words is "nine billion, seven hundred eighty-nine million, seven hundred seventy-nine thousand, eight hundred eighty".