9123728 has 10 divisors (see below), whose sum is σ = 17677254. Its totient is φ = 4561856.

The previous prime is 9123721. The next prime is 9123739. The reversal of 9123728 is 8273219.

It can be written as a sum of positive squares in only one way, i.e., 5234944 + 3888784 = 2288^2 + 1972^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9123694 and 9123703.

It is not an unprimeable number, because it can be changed into a prime (9123721) by changing a digit.

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 as a sum of consecutive naturals, namely, 285101 + ... + 285132.

Almost surely, 2^9123728 is an apocalyptic number.

It is an amenable number.

9123728 is a deficient number, since it is larger than the sum of its proper divisors (8553526).

9123728 is a wasteful number, since it uses less digits than its factorization.

9123728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570241 (or 570235 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 9123728 is about 3020.5509431228. The cubic root of 9123728 is about 208.9572495606.

The spelling of 9123728 in words is "nine million, one hundred twenty-three thousand, seven hundred twenty-eight".