8427728 has 10 divisors (see below), whose sum is σ = 16328754. Its totient is φ = 4213856.

The previous prime is 8427721. The next prime is 8427739. The reversal of 8427728 is 8277248.

It can be written as a sum of positive squares in only one way, i.e., 5071504 + 3356224 = 2252^2 + 1832^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8427691 and 8427700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8427721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263351 + ... + 263382.

Almost surely, 2^8427728 is an apocalyptic number.

It is an amenable number.

8427728 is a deficient number, since it is larger than the sum of its proper divisors (7901026).

8427728 is a wasteful number, since it uses less digits than its factorization.

8427728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526741 (or 526735 counting only the distinct ones).

The product of its digits is 50176, while the sum is 38.

The square root of 8427728 is about 2903.0549426423. The cubic root of 8427728 is about 203.5026974350.

The spelling of 8427728 in words is "eight million, four hundred twenty-seven thousand, seven hundred twenty-eight".