51724 has 12 divisors (see below), whose sum is σ = 92344. Its totient is φ = 25344.

The previous prime is 51721. The next prime is 51749. The reversal of 51724 is 42715.

It is not an unprimeable number, because it can be changed into a prime (51721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172 + ... + 364.

2⁵¹⁷²⁴ is an apocalyptic number.

It is an amenable number.

51724 is a deficient number, since it is larger than the sum of its proper divisors (40620).

51724 is a wasteful number, since it uses less digits than its factorization.

51724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 262 counting only the distinct ones).

The product of its digits is 280, while the sum is 19.

The square root of 51724 is about 227.4291098343. The cubic root of 51724 is about 37.2589576524.

Subtracting from 51724 its reverse (42715), we obtain a palindrome (9009).

The spelling of 51724 in words is "fifty-one thousand, seven hundred twenty-four".