8243728 has 10 divisors (see below), whose sum is σ = 15972254. Its totient is φ = 4121856.

The previous prime is 8243713. The next prime is 8243731. The reversal of 8243728 is 8273428.

It can be written as a sum of positive squares in only one way, i.e., 7551504 + 692224 = 2748^2 + 832^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8243693 and 8243702.

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 as a sum of consecutive naturals, namely, 257601 + ... + 257632.

Almost surely, 2^8243728 is an apocalyptic number.

It is an amenable number.

8243728 is a deficient number, since it is larger than the sum of its proper divisors (7728526).

8243728 is a wasteful number, since it uses less digits than its factorization.

8243728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515241 (or 515235 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 8243728 is about 2871.1893006209. The cubic root of 8243728 is about 202.0107826810.

The spelling of 8243728 in words is "eight million, two hundred forty-three thousand, seven hundred twenty-eight".