57249728 has 14 divisors (see below), whose sum is σ = 113605056. Its totient is φ = 28624832.

The previous prime is 57249721. The next prime is 57249733. The reversal of 57249728 is 82794275.

57249728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×57249728³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57249721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 447200 + ... + 447327.

Almost surely, 2^57249728 is an apocalyptic number.

It is an amenable number.

57249728 is a deficient number, since it is larger than the sum of its proper divisors (56355328).

57249728 is an equidigital number, since it uses as much as digits as its factorization.

57249728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894539 (or 894529 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The square root of 57249728 is about 7566.3550009235. The cubic root of 57249728 is about 385.4113285312.

The spelling of 57249728 in words is "fifty-seven million, two hundred forty-nine thousand, seven hundred twenty-eight".