55863 has 8 divisors (see below), whose sum is σ = 82800. Its totient is φ = 37224.

The previous prime is 55849. The next prime is 55871. The reversal of 55863 is 36855.

55863 is nontrivially palindromic in base 5.

It is not a de Polignac number, because 55863 - 2⁶ = 55799 is a prime.

It is a super-4 number, since 4×55863⁴ = 38954444055492813444, which contains 4444 as substring.

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: 2069 = 55863 / (5 + 5 + 8 + 6 + 3).

It is an Ulam number.

55863 is a lucky number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55813) 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, 1008 + ... + 1061.

It is an arithmetic number, because the mean of its divisors is an integer number (10350).

2⁵⁵⁸⁶³ is an apocalyptic number.

55863 is a deficient number, since it is larger than the sum of its proper divisors (26937).

55863 is a wasteful number, since it uses less digits than its factorization.

55863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078 (or 2072 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 55863 is about 236.3535487358. The cubic root of 55863 is about 38.2273991821.

The spelling of 55863 in words is "fifty-five thousand, eight hundred sixty-three".