520690 has 8 divisors (see below), whose sum is σ = 937260. Its totient is φ = 208272.

The previous prime is 520679. The next prime is 520691. The reversal of 520690 is 96025.

It can be written as a sum of positive squares in 2 ways, for example, as 508369 + 12321 = 713^2 + 111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×520690² = 542236152200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (520691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26025 + ... + 26044.

2⁵²⁰⁶⁹⁰ is an apocalyptic number.

520690 is a deficient number, since it is larger than the sum of its proper divisors (416570).

520690 is a wasteful number, since it uses less digits than its factorization.

520690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52076.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 520690 is about 721.5885254077. The cubic root of 520690 is about 80.4500674100.

The spelling of 520690 in words is "five hundred twenty thousand, six hundred ninety".