9928665 has 24 divisors (see below), whose sum is σ = 17496648. Its totient is φ = 5207040.

The previous prime is 9928661. The next prime is 9928669. The reversal of 9928665 is 5668299.

It is an interprime number because it is at equal distance from previous prime (9928661) and next prime (9928669).

It can be written as a sum of positive squares in 4 ways, for example, as 1089936 + 8838729 = 1044^2 + 2973^2 .

It is not a de Polignac number, because 9928665 - 2² = 9928661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 9928665.

It is not an unprimeable number, because it can be changed into a prime (9928661) 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, 937 + ... + 4553.

It is an arithmetic number, because the mean of its divisors is an integer number (729027).

Almost surely, 2^9928665 is an apocalyptic number.

It is an amenable number.

9928665 is a deficient number, since it is larger than the sum of its proper divisors (7567983).

9928665 is a wasteful number, since it uses less digits than its factorization.

9928665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689 (or 3686 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 9928665 is about 3150.9784194754. The cubic root of 9928665 is about 214.9299573535.

The spelling of 9928665 in words is "nine million, nine hundred twenty-eight thousand, six hundred sixty-five".