9728728 has 8 divisors (see below), whose sum is σ = 18241380. Its totient is φ = 4864360.

The previous prime is 9728681. The next prime is 9728729. The reversal of 9728728 is 8278279.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9728729) by changing a digit.

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, 608038 + ... + 608053.

Almost surely, 2^9728728 is an apocalyptic number.

It is an amenable number.

9728728 is a deficient number, since it is larger than the sum of its proper divisors (8512652).

9728728 is a wasteful number, since it uses less digits than its factorization.

9728728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216097 (or 1216093 counting only the distinct ones).

The product of its digits is 112896, while the sum is 43.

The square root of 9728728 is about 3119.0908931931. The cubic root of 9728728 is about 213.4774568647.

The spelling of 9728728 in words is "nine million, seven hundred twenty-eight thousand, seven hundred twenty-eight".