9729728 has 14 divisors (see below), whose sum is σ = 19307556. Its totient is φ = 4864832.

The previous prime is 9729697. The next prime is 9729743. The reversal of 9729728 is 8279279.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75950 + ... + 76077.

Almost surely, 2^9729728 is an apocalyptic number.

It is an amenable number.

9729728 is a deficient number, since it is larger than the sum of its proper divisors (9577828).

9729728 is a wasteful number, since it uses less digits than its factorization.

9729728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152039 (or 152029 counting only the distinct ones).

The product of its digits is 127008, while the sum is 44.

The square root of 9729728 is about 3119.2511921934. The cubic root of 9729728 is about 213.4847709467.

The spelling of 9729728 in words is "nine million, seven hundred twenty-nine thousand, seven hundred twenty-eight".