9928328881 has 9 divisors (see below), whose sum is σ = 10207704801. Its totient is φ = 9656408592.

The previous prime is 9928328849. The next prime is 9928328897. The reversal of 9928328881 is 1888238299.

The square root of 9928328881 is 99641.

It is a perfect power (a square), and thus also a powerful number.

9928328881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1264442481 + 8663886400 = 35559^2 + 93080^2 .

It is not a de Polignac number, because 9928328881 - 2⁵ = 9928328849 is a prime.

It is a super-2 number, since 2×9928328881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9928328981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3685371 + ... + 3688063.

Almost surely, 2^9928328881 is an apocalyptic number.

9928328881 is the 99641-st square number.

9928328881 is the 49821-st centered octagonal number.

It is an amenable number.

9928328881 is a deficient number, since it is larger than the sum of its proper divisors (279375920).

9928328881 is an frugal number, since it uses more digits than its factorization.

9928328881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5460 (or 2730 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 58.

The cubic root of 9928328881 is about 2149.2753195664.

It can be divided in two parts, 99283 and 28881, that added together give a square (128164 = 358²).

The spelling of 9928328881 in words is "nine billion, nine hundred twenty-eight million, three hundred twenty-eight thousand, eight hundred eighty-one".