51868 has 6 divisors (see below), whose sum is σ = 90776. Its totient is φ = 25932.

The previous prime is 51859. The next prime is 51869. The reversal of 51868 is 86815.

It is a happy number.

51868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51869) by changing a digit.

51868 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, 6480 + ... + 6487.

2⁵¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

51868 is a deficient number, since it is larger than the sum of its proper divisors (38908).

51868 is a wasteful number, since it uses less digits than its factorization.

51868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12971 (or 12969 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 51868 is about 227.7454719638. The cubic root of 51868 is about 37.2935020198.

It can be divided in two parts, 51 and 868, that added together give a palindrome (919).

The spelling of 51868 in words is "fifty-one thousand, eight hundred sixty-eight".