9999789772 has 24 divisors (see below), whose sum is σ = 20001897216. Its totient is φ = 4285127568.

The previous prime is 9999789757. The next prime is 9999789781. The reversal of 9999789772 is 2779879999.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328803 + ... + 357925.

It is an arithmetic number, because the mean of its divisors is an integer number (833412384).

Almost surely, 2^9999789772 is an apocalyptic number.

It is an amenable number.

9999789772 is an abundant number, since it is smaller than the sum of its proper divisors (10002107444).

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

9999789772 is a wasteful number, since it uses less digits than its factorization.

9999789772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41397 (or 41395 counting only the distinct ones).

The product of its digits is 324060912, while the sum is 76.

The square root of 9999789772 is about 99998.9488544755. The cubic root of 9999789772 is about 2154.4195925096.

The spelling of 9999789772 in words is "nine billion, nine hundred ninety-nine million, seven hundred eighty-nine thousand, seven hundred seventy-two".