9728557 has 2 divisors, whose sum is σ = 9728558. Its totient is φ = 9728556.

The previous prime is 9728533. The next prime is 9728567. The reversal of 9728557 is 7558279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7123561 + 2604996 = 2669^2 + 1614^2 .

It is an emirp because it is prime and its reverse (7558279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9728557 - 2⁷ = 9728429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9728527) 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, 4864278 + 4864279.

It is an arithmetic number, because the mean of its divisors is an integer number (4864279).

Almost surely, 2^9728557 is an apocalyptic number.

It is an amenable number.

9728557 is a deficient number, since it is larger than the sum of its proper divisors (1).

9728557 is an equidigital number, since it uses as much as digits as its factorization.

9728557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 43.

The square root of 9728557 is about 3119.0634812392. The cubic root of 9728557 is about 213.4762061065.

The spelling of 9728557 in words is "nine million, seven hundred twenty-eight thousand, five hundred fifty-seven".