57285821 has 4 divisors (see below), whose sum is σ = 57303132. Its totient is φ = 57268512.

The previous prime is 57285791. The next prime is 57285841. The reversal of 57285821 is 12858275.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26925721 + 30360100 = 5189^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 57285821 - 2¹⁰ = 57284797 is a prime.

It is a super-3 number, since 3×57285821³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57285841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1970 + ... + 10883.

It is an arithmetic number, because the mean of its divisors is an integer number (14325783).

Almost surely, 2^57285821 is an apocalyptic number.

It is an amenable number.

57285821 is a deficient number, since it is larger than the sum of its proper divisors (17311).

57285821 is a wasteful number, since it uses less digits than its factorization.

57285821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17310.

The product of its digits is 44800, while the sum is 38.

The square root of 57285821 is about 7568.7397233621. The cubic root of 57285821 is about 385.4923055028.

The spelling of 57285821 in words is "fifty-seven million, two hundred eighty-five thousand, eight hundred twenty-one".