9728819657 has 8 divisors (see below), whose sum is σ = 10159779840. Its totient is φ = 9298523520.

The previous prime is 9728819651. The next prime is 9728819663. The reversal of 9728819657 is 7569188279.

9728819657 is digitally balanced in base 3, 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 (9728819651) and next prime (9728819663).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9728819657 - 2²⁴ = 9712042441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9728819657.

It is not an unprimeable number, because it can be changed into a prime (9728819651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135944 + ... + 194777.

It is an arithmetic number, because the mean of its divisors is an integer number (1269972480).

Almost surely, 2^9728819657 is an apocalyptic number.

It is an amenable number.

9728819657 is a deficient number, since it is larger than the sum of its proper divisors (430960183).

9728819657 is a wasteful number, since it uses less digits than its factorization.

9728819657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332023.

The product of its digits is 15240960, while the sum is 62.

The square root of 9728819657 is about 98634.7791450865. The cubic root of 9728819657 is about 2134.7812727238.

The spelling of 9728819657 in words is "nine billion, seven hundred twenty-eight million, eight hundred nineteen thousand, six hundred fifty-seven".