9779339778 has 32 divisors (see below), whose sum is σ = 21978988416. Its totient is φ = 2878199808.

The previous prime is 9779339753. The next prime is 9779339827. The reversal of 9779339778 is 8779339779.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2723775 + ... + 2727362.

It is an arithmetic number, because the mean of its divisors is an integer number (686843388).

Almost surely, 2^9779339778 is an apocalyptic number.

9779339778 is an abundant number, since it is smaller than the sum of its proper divisors (12199648638).

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

9779339778 is a wasteful number, since it uses less digits than its factorization.

9779339778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5451178.

The product of its digits is 126023688, while the sum is 69.

The square root of 9779339778 is about 98890.5444317100. The cubic root of 9779339778 is about 2138.4700814192.

Subtracting from 9779339778 its reverse (8779339779), we obtain a palindrome (999999999).

The spelling of 9779339778 in words is "nine billion, seven hundred seventy-nine million, three hundred thirty-nine thousand, seven hundred seventy-eight".