9719999980 has 12 divisors (see below), whose sum is σ = 20412000000. Its totient is φ = 3887999984.

The previous prime is 9719999959. The next prime is 9720000007. The reversal of 9719999980 is 899999179.

It is a super-2 number, since 2×9719999980² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242999980 + ... + 243000019.

It is an arithmetic number, because the mean of its divisors is an integer number (1701000000).

Almost surely, 2^9719999980 is an apocalyptic number.

It is an amenable number.

9719999980 is an abundant number, since it is smaller than the sum of its proper divisors (10692000020).

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

9719999980 is a wasteful number, since it uses less digits than its factorization.

9719999980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486000008 (or 486000006 counting only the distinct ones).

The product of its (nonzero) digits is 29760696, while the sum is 70.

The square root of 9719999980 is about 98590.0602494998. The cubic root of 9719999980 is about 2134.1359812303.

The spelling of 9719999980 in words is "nine billion, seven hundred nineteen million, nine hundred ninety-nine thousand, nine hundred eighty".