9779889779 has 8 divisors (see below), whose sum is σ = 11230495680. Its totient is φ = 8422871400.

The previous prime is 9779889671. The next prime is 9779889781.

9779889779 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9779889779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9779880779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23396657 + ... + 23397074.

It is an arithmetic number, because the mean of its divisors is an integer number (1403811960).

Almost surely, 2^9779889779 is an apocalyptic number.

9779889779 is a deficient number, since it is larger than the sum of its proper divisors (1450605901).

9779889779 is a wasteful number, since it uses less digits than its factorization.

9779889779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46793761.

The product of its digits is 1008189504, while the sum is 80.

The square root of 9779889779 is about 98893.3252499884. The cubic root of 9779889779 is about 2138.5101706502.

The spelling of 9779889779 in words is "nine billion, seven hundred seventy-nine million, eight hundred eighty-nine thousand, seven hundred seventy-nine".