57250728 has 24 divisors (see below), whose sum is σ = 155054250. Its totient is φ = 19083552.

The previous prime is 57250723. The next prime is 57250741. The reversal of 57250728 is 82705275.

57250728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 49533444 + 7717284 = 7038^2 + 2778^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 57250692 and 57250701.

It is not an unprimeable number, because it can be changed into a prime (57250723) 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 in 5 ways as a sum of consecutive naturals, for example, 397503 + ... + 397646.

Almost surely, 2^57250728 is an apocalyptic number.

It is an amenable number.

57250728 is an abundant number, since it is smaller than the sum of its proper divisors (97803522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57250728 is a wasteful number, since it uses less digits than its factorization.

57250728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795161 (or 795154 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 57250728 is about 7566.4210826520. The cubic root of 57250728 is about 385.4135725540.

The spelling of 57250728 in words is "fifty-seven million, two hundred fifty thousand, seven hundred twenty-eight".