520520 has 96 divisors (see below), whose sum is σ = 1581120. Its totient is φ = 149760.

The previous prime is 520451. The next prime is 520529. The reversal of 520520 is 25025.

520520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 520495 and 520504.

It is not an unprimeable number, because it can be changed into a prime (520529) by changing a digit.

520520 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 in 23 ways as a sum of consecutive naturals, for example, 40034 + ... + 40046.

It is an arithmetic number, because the mean of its divisors is an integer number (16470).

2⁵²⁰⁵²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790560).

520520 is an abundant number, since it is smaller than the sum of its proper divisors (1060600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

520520 is a wasteful number, since it uses less digits than its factorization.

520520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 520520 is about 721.4707201266. The cubic root of 520520 is about 80.4413110802.

Adding to 520520 its reverse (25025), we get a palindrome (545545).

It can be divided in two parts, 5205 and 20, that added together give a palindrome (5225).

The spelling of 520520 in words is "five hundred twenty thousand, five hundred twenty".