520757 has 4 divisors (see below), whose sum is σ = 529356. Its totient is φ = 512160.

The previous prime is 520747. The next prime is 520759. The reversal of 520757 is 757025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 217156 + 303601 = 466^2 + 551^2 .

It is a cyclic number.

It is not a de Polignac number, because 520757 - 2¹⁰ = 519733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520759) 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, 4208 + ... + 4329.

It is an arithmetic number, because the mean of its divisors is an integer number (132339).

2⁵²⁰⁷⁵⁷ is an apocalyptic number.

It is an amenable number.

520757 is a deficient number, since it is larger than the sum of its proper divisors (8599).

520757 is an equidigital number, since it uses as much as digits as its factorization.

520757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8598.

The product of its (nonzero) digits is 2450, while the sum is 26.

The square root of 520757 is about 721.6349492645. The cubic root of 520757 is about 80.4535179105.

The spelling of 520757 in words is "five hundred twenty thousand, seven hundred fifty-seven".