9928427880 has 128 divisors (see below), whose sum is σ = 34060953600. Its totient is φ = 2267980032.

The previous prime is 9928427833. The next prime is 9928427891. The reversal of 9928427880 is 887248299.

It is a super-2 number, since 2×9928427880² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9928427880.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2164069 + ... + 2168651.

It is an arithmetic number, because the mean of its divisors is an integer number (266101200).

Almost surely, 2^9928427880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9928427880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17030476800).

9928427880 is an abundant number, since it is smaller than the sum of its proper divisors (24132525720).

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

9928427880 is a wasteful number, since it uses less digits than its factorization.

9928427880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7183 (or 7179 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 57.

The square root of 9928427880 is about 99641.4967771962. The cubic root of 9928427880 is about 2149.2824632796.

The spelling of 9928427880 in words is "nine billion, nine hundred twenty-eight million, four hundred twenty-seven thousand, eight hundred eighty".