57281928 has 64 divisors (see below), whose sum is σ = 158829120. Its totient is φ = 17068800.

The previous prime is 57281899. The next prime is 57281947. The reversal of 57281928 is 82918275.

It is a self number, because there is not a number n which added to its sum of digits gives 57281928.

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 in 15 ways as a sum of consecutive naturals, for example, 14326 + ... + 17882.

It is an arithmetic number, because the mean of its divisors is an integer number (2481705).

Almost surely, 2^57281928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57281928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79414560).

57281928 is an abundant number, since it is smaller than the sum of its proper divisors (101547192).

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

57281928 is a wasteful number, since it uses less digits than its factorization.

57281928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3638 (or 3634 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 57281928 is about 7568.4825427558. The cubic root of 57281928 is about 385.4835729432.

The spelling of 57281928 in words is "fifty-seven million, two hundred eighty-one thousand, nine hundred twenty-eight".