9930728 has 8 divisors (see below), whose sum is σ = 18620130. Its totient is φ = 4965360.

The previous prime is 9930707. The next prime is 9930773. The reversal of 9930728 is 8270399.

It can be written as a sum of positive squares in only one way, i.e., 9872164 + 58564 = 3142^2 + 242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 9930691 and 9930700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620663 + ... + 620678.

Almost surely, 2^9930728 is an apocalyptic number.

It is an amenable number.

9930728 is a deficient number, since it is larger than the sum of its proper divisors (8689402).

9930728 is a wasteful number, since it uses less digits than its factorization.

9930728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241347 (or 1241343 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 9930728 is about 3151.3057611092. The cubic root of 9930728 is about 214.9448425300.

The spelling of 9930728 in words is "nine million, nine hundred thirty thousand, seven hundred twenty-eight".