520381520 has 20 divisors (see below), whose sum is σ = 1209887220. Its totient is φ = 208152576.

The previous prime is 520381513. The next prime is 520381559. The reversal of 520381520 is 25183025.

It can be written as a sum of positive squares in 2 ways, for example, as 247999504 + 272382016 = 15748^2 + 16504^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 520381520.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3252305 + ... + 3252464.

It is an arithmetic number, because the mean of its divisors is an integer number (60494361).

Almost surely, 2^520381520 is an apocalyptic number.

It is an amenable number.

520381520 is an abundant number, since it is smaller than the sum of its proper divisors (689505700).

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

520381520 is a wasteful number, since it uses less digits than its factorization.

520381520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6504782 (or 6504776 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 520381520 is about 22811.8723475299. The cubic root of 520381520 is about 804.3417686776.

The spelling of 520381520 in words is "five hundred twenty million, three hundred eighty-one thousand, five hundred twenty".