9728428 has 12 divisors (see below), whose sum is σ = 17046792. Its totient is φ = 4857920.

The previous prime is 9728423. The next prime is 9728429. The reversal of 9728428 is 8248279.

It is a super-2 number, since 2×9728428² = 189284622702368, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9728423) 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 in 3 ways as a sum of consecutive naturals, for example, 4551 + ... + 6337.

It is an arithmetic number, because the mean of its divisors is an integer number (1420566).

Almost surely, 2^9728428 is an apocalyptic number.

It is an amenable number.

9728428 is a deficient number, since it is larger than the sum of its proper divisors (7318364).

9728428 is a wasteful number, since it uses less digits than its factorization.

9728428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3152 (or 3150 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 9728428 is about 3119.0428018865. The cubic root of 9728428 is about 213.4752625424.

The spelling of 9728428 in words is "nine million, seven hundred twenty-eight thousand, four hundred twenty-eight".