9779398772 has 24 divisors (see below), whose sum is σ = 20105897952. Its totient is φ = 4103244000.

The previous prime is 9779398771. The next prime is 9779398799. The reversal of 9779398772 is 2778939779.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9779398771) 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, 8547854 + ... + 8548997.

It is an arithmetic number, because the mean of its divisors is an integer number (837745748).

Almost surely, 2^9779398772 is an apocalyptic number.

It is an amenable number.

9779398772 is an abundant number, since it is smaller than the sum of its proper divisors (10326499180).

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

9779398772 is a wasteful number, since it uses less digits than its factorization.

9779398772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17096879 (or 17096877 counting only the distinct ones).

The product of its digits is 84015792, while the sum is 68.

The square root of 9779398772 is about 98890.8427105361. The cubic root of 9779398772 is about 2138.4743815272.

The spelling of 9779398772 in words is "nine billion, seven hundred seventy-nine million, three hundred ninety-eight thousand, seven hundred seventy-two".