9781328384 has 20 divisors (see below), whose sum is σ = 19543553634. Its totient is φ = 4890663936.

The previous prime is 9781328377. The next prime is 9781328449. The reversal of 9781328384 is 4838231879.

It can be written as a sum of positive squares in only one way, i.e., 7451142400 + 2330185984 = 86320^2 + 48272^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9551567 + ... + 9552590.

Almost surely, 2^9781328384 is an apocalyptic number.

It is an amenable number.

9781328384 is a deficient number, since it is larger than the sum of its proper divisors (9762225250).

9781328384 is an equidigital number, since it uses as much as digits as its factorization.

9781328384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19104175 (or 19104159 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 53.

The square root of 9781328384 is about 98900.5985017280. The cubic root of 9781328384 is about 2138.6150225677.

The spelling of 9781328384 in words is "nine billion, seven hundred eighty-one million, three hundred twenty-eight thousand, three hundred eighty-four".