9728666 has 8 divisors (see below), whose sum is σ = 14640564. Its totient is φ = 4848480.

The previous prime is 9728651. The next prime is 9728681. The reversal of 9728666 is 6668279.

It is an interprime number because it is at equal distance from previous prime (9728651) and next prime (9728681).

It can be written as a sum of positive squares in 2 ways, for example, as 9333025 + 395641 = 3055^2 + 629^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7145 + ... + 8396.

Almost surely, 2^9728666 is an apocalyptic number.

9728666 is a deficient number, since it is larger than the sum of its proper divisors (4911898).

9728666 is a wasteful number, since it uses less digits than its factorization.

9728666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15856.

The product of its digits is 217728, while the sum is 44.

The square root of 9728666 is about 3119.0809543838. The cubic root of 9728666 is about 213.4770033751.

The spelling of 9728666 in words is "nine million, seven hundred twenty-eight thousand, six hundred sixty-six".