9728170817 has 4 divisors (see below), whose sum is σ = 9782518320. Its totient is φ = 9673823316.

The previous prime is 9728170811. The next prime is 9728170841. The reversal of 9728170817 is 7180718279.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9728170817 - 2⁸ = 9728170561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9728170811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27173483 + ... + 27173840.

It is an arithmetic number, because the mean of its divisors is an integer number (2445629580).

Almost surely, 2^9728170817 is an apocalyptic number.

It is an amenable number.

9728170817 is a deficient number, since it is larger than the sum of its proper divisors (54347503).

9728170817 is a wasteful number, since it uses less digits than its factorization.

9728170817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54347502.

The product of its (nonzero) digits is 395136, while the sum is 50.

The square root of 9728170817 is about 98631.4899867177. The cubic root of 9728170817 is about 2134.7338136513.

The spelling of 9728170817 in words is "nine billion, seven hundred twenty-eight million, one hundred seventy thousand, eight hundred seventeen".