8457728 has 20 divisors (see below), whose sum is σ = 16899960. Its totient is φ = 4228608.

The previous prime is 8457727. The next prime is 8457731. The reversal of 8457728 is 8277548.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8457727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7748 + ... + 8771.

It is an arithmetic number, because the mean of its divisors is an integer number (844998).

Almost surely, 2^8457728 is an apocalyptic number.

It is an amenable number.

8457728 is a deficient number, since it is larger than the sum of its proper divisors (8442232).

8457728 is an equidigital number, since it uses as much as digits as its factorization.

8457728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16537 (or 16521 counting only the distinct ones).

The product of its digits is 125440, while the sum is 41.

The square root of 8457728 is about 2908.2173233787. The cubic root of 8457728 is about 203.7438795256.

The spelling of 8457728 in words is "eight million, four hundred fifty-seven thousand, seven hundred twenty-eight".