57286321 has 4 divisors (see below), whose sum is σ = 57412132. Its totient is φ = 57160512.

The previous prime is 57286309. The next prime is 57286331. The reversal of 57286321 is 12368275.

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 41990400 + 15295921 = 6480^2 + 3911^2 .

It is a cyclic number.

It is not a de Polignac number, because 57286321 - 2⁷ = 57286193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57286301) 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, 62220 + ... + 63133.

It is an arithmetic number, because the mean of its divisors is an integer number (14353033).

Almost surely, 2^57286321 is an apocalyptic number.

It is an amenable number.

57286321 is a deficient number, since it is larger than the sum of its proper divisors (125811).

57286321 is a wasteful number, since it uses less digits than its factorization.

57286321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125810.

The product of its digits is 20160, while the sum is 34.

The square root of 57286321 is about 7568.7727538882. The cubic root of 57286321 is about 385.4934270461.

The spelling of 57286321 in words is "fifty-seven million, two hundred eighty-six thousand, three hundred twenty-one".