9728443757 has 2 divisors, whose sum is σ = 9728443758. Its totient is φ = 9728443756.

The previous prime is 9728443729. The next prime is 9728443759. The reversal of 9728443757 is 7573448279.

It is a happy number.

9728443757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7112223556 + 2616220201 = 84334^2 + 51149^2 .

It is a cyclic number.

It is not a de Polignac number, because 9728443757 - 2¹² = 9728439661 is a prime.

It is a super-2 number, since 2×9728443757² (a number of 21 digits) contains 22 as substring.

Together with 9728443759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9728443759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4864221878 + 4864221879.

It is an arithmetic number, because the mean of its divisors is an integer number (4864221879).

Almost surely, 2^9728443757 is an apocalyptic number.

It is an amenable number.

9728443757 is a deficient number, since it is larger than the sum of its proper divisors (1).

9728443757 is an equidigital number, since it uses as much as digits as its factorization.

9728443757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11854080, while the sum is 56.

The square root of 9728443757 is about 98632.8736121989. The cubic root of 9728443757 is about 2134.7537779662.

The spelling of 9728443757 in words is "nine billion, seven hundred twenty-eight million, four hundred forty-three thousand, seven hundred fifty-seven".