9728663 has 4 divisors (see below), whose sum is σ = 11118480. Its totient is φ = 8338848.

The previous prime is 9728651. The next prime is 9728681. The reversal of 9728663 is 3668279.

9728663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9728663 - 2¹⁶ = 9663127 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 9728663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9728263) 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, 694898 + ... + 694911.

It is an arithmetic number, because the mean of its divisors is an integer number (2779620).

Almost surely, 2^9728663 is an apocalyptic number.

9728663 is a deficient number, since it is larger than the sum of its proper divisors (1389817).

9728663 is a wasteful number, since it uses less digits than its factorization.

9728663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389816.

The product of its digits is 108864, while the sum is 41.

The square root of 9728663 is about 3119.0804734729. The cubic root of 9728663 is about 213.4769814320.

The spelling of 9728663 in words is "nine million, seven hundred twenty-eight thousand, six hundred sixty-three".