520728 has 32 divisors (see below), whose sum is σ = 1402800. Its totient is φ = 160128.

The previous prime is 520721. The next prime is 520747. The reversal of 520728 is 827025.

520728 = T₁₈₇ + T₁₈₈ + ... + T₂₁₂.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 520698 and 520707.

It is a congruent number.

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

520728 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 7 ways as a sum of consecutive naturals, for example, 523 + ... + 1146.

2⁵²⁰⁷²⁸ is an apocalyptic number.

It is an amenable number.

520728 is an abundant number, since it is smaller than the sum of its proper divisors (882072).

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

520728 is a wasteful number, since it uses less digits than its factorization.

520728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691 (or 1687 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 520728 is about 721.6148557229. The cubic root of 520728 is about 80.4520244466.

The spelling of 520728 in words is "five hundred twenty thousand, seven hundred twenty-eight".