57866 has 4 divisors (see below), whose sum is σ = 86802. Its totient is φ = 28932.

The previous prime is 57859. The next prime is 57881. The reversal of 57866 is 66875.

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

It can be written as a sum of positive squares in only one way, i.e., 48841 + 9025 = 221^2 + 95^2 .

It is a Curzon number.

It is a plaindrome in base 15.

It is an unprimeable number.

57866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14465 + ... + 14468.

2⁵⁷⁸⁶⁶ is an apocalyptic number.

57866 is a deficient number, since it is larger than the sum of its proper divisors (28936).

57866 is a wasteful number, since it uses less digits than its factorization.

57866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28935.

The product of its digits is 10080, while the sum is 32.

The square root of 57866 is about 240.5535283466. The cubic root of 57866 is about 38.6789332201.

Subtracting 57866 from its reverse (66875), we obtain a palindrome (9009).

It can be divided in two parts, 5786 and 6, that multiplied together give a triangular number (34716 = T₂₆₃).

The spelling of 57866 in words is "fifty-seven thousand, eight hundred sixty-six".