9728248491 has 24 divisors (see below), whose sum is σ = 15484765296. Its totient is φ = 5847387840.

The previous prime is 9728248489. The next prime is 9728248531. The reversal of 9728248491 is 1948428279.

9728248491 is a `hidden beast` number, since 9 + 72 + 8 + 2 + 484 + 91 = 666.

9728248491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9728248491 - 2¹ = 9728248489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9728248451) 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 in 23 ways as a sum of consecutive naturals, for example, 961800 + ... + 971861.

It is an arithmetic number, because the mean of its divisors is an integer number (645198554).

Almost surely, 2^9728248491 is an apocalyptic number.

9728248491 is a deficient number, since it is larger than the sum of its proper divisors (5756516805).

9728248491 is a wasteful number, since it uses less digits than its factorization.

9728248491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933723 (or 1933720 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 9728248491 is about 98631.8837445580. The cubic root of 9728248491 is about 2134.7394951878.

The spelling of 9728248491 in words is "nine billion, seven hundred twenty-eight million, two hundred forty-eight thousand, four hundred ninety-one".