57861 has 8 divisors (see below), whose sum is σ = 85760. Its totient is φ = 38556.

The previous prime is 57859. The next prime is 57881. The reversal of 57861 is 16875.

It is not a de Polignac number, because 57861 - 2¹ = 57859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2143 = 57861 / (5 + 7 + 8 + 6 + 1).

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1045 + ... + 1098.

It is an arithmetic number, because the mean of its divisors is an integer number (10720).

2⁵⁷⁸⁶¹ is an apocalyptic number.

It is an amenable number.

57861 is a deficient number, since it is larger than the sum of its proper divisors (27899).

57861 is a wasteful number, since it uses less digits than its factorization.

57861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152 (or 2146 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 57861 is about 240.5431354248. The cubic root of 57861 is about 38.6778191506.

The spelling of 57861 in words is "fifty-seven thousand, eight hundred sixty-one".