9728491899 has 12 divisors (see below), whose sum is σ = 15089089704. Its totient is φ = 5559138144.

The previous prime is 9728491897. The next prime is 9728491901. The reversal of 9728491899 is 9981948279.

9728491899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9728491897) and next prime (9728491901).

It is not a de Polignac number, because 9728491899 - 2¹ = 9728491897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9728491897) 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 11 ways as a sum of consecutive naturals, for example, 33089962 + ... + 33090255.

It is an arithmetic number, because the mean of its divisors is an integer number (1257424142).

Almost surely, 2^9728491899 is an apocalyptic number.

9728491899 is a deficient number, since it is larger than the sum of its proper divisors (5360597805).

9728491899 is a wasteful number, since it uses less digits than its factorization.

9728491899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66180234 (or 66180227 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 66.

The square root of 9728491899 is about 98633.1176583200. The cubic root of 9728491899 is about 2134.7572992950.

The spelling of 9728491899 in words is "nine billion, seven hundred twenty-eight million, four hundred ninety-one thousand, eight hundred ninety-nine".