520724 has 18 divisors (see below), whose sum is σ = 956970. Its totient is φ = 247632.

The previous prime is 520721. The next prime is 520747. The reversal of 520724 is 427025.

It can be written as a sum of positive squares in only one way, i.e., 448900 + 71824 = 670^2 + 268^2 .

It is a junction number, because it is equal to n+sod(n) for n = 520696 and 520705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7739 + ... + 7805.

It is an arithmetic number, because the mean of its divisors is an integer number (53165).

2⁵²⁰⁷²⁴ is an apocalyptic number.

It is an amenable number.

520724 is a deficient number, since it is larger than the sum of its proper divisors (436246).

520724 is a wasteful number, since it uses less digits than its factorization.

520724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 520724 is about 721.6120841560. The cubic root of 520724 is about 80.4518184473.

Adding to 520724 its product of nonzero digits (560), we get a square (521284 = 722²).

Adding to 520724 its reverse (427025), we get a palindrome (947749).

The spelling of 520724 in words is "five hundred twenty thousand, seven hundred twenty-four".