55786 has 4 divisors (see below), whose sum is σ = 83682.
Its totient is φ = 27892.
The previous prime is 55763. The next prime is 55787. The reversal of 55786 is 68755.
Subtracting from 55786 its sum of digits (31), we obtain a palindrome (55755).
It can be divided in two parts, 55 and 786, that added together give a square (841 = 292).
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68755 = 5 ⋅13751.
It can be written as a sum of positive squares in only one way, i.e., 28561 + 27225 = 169^2 + 165^2
It is a super-2 number, since 2×557862 = 6224155592, which contains 22 as substring.
It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is not an unprimeable number, because it can be changed into a prime (55787) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13945 + ... + 13948.
255786 is an apocalyptic number.
55786 is a deficient number, since it is larger than the sum of its proper divisors (27896).
55786 is a wasteful number, since it uses less digits than its factorization.
55786 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 27895.
The product of its digits is 8400, while the sum is 31.
The square root of 55786 is about 236.1906009984.
The cubic root of 55786 is about 38.2098272461.
The spelling of 55786 in words is "fifty-five thousand, seven hundred eighty-six".