520036645 has 4 divisors (see below), whose sum is σ = 624043980. Its totient is φ = 416029312.

The previous prime is 520036639. The next prime is 520036663. The reversal of 520036645 is 546630025.

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 336759201 + 183277444 = 18351^2 + 13538^2 .

It is a cyclic number.

It is not a de Polignac number, because 520036645 - 2¹¹ = 520034597 is a prime.

It is a super-2 number, since 2×520036645² = 540876224285712050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52003660 + ... + 52003669.

It is an arithmetic number, because the mean of its divisors is an integer number (156010995).

Almost surely, 2^520036645 is an apocalyptic number.

It is an amenable number.

520036645 is a deficient number, since it is larger than the sum of its proper divisors (104007335).

520036645 is a wasteful number, since it uses less digits than its factorization.

520036645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104007334.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 520036645 is about 22804.3119826054. The cubic root of 520036645 is about 804.1640409530.

The spelling of 520036645 in words is "five hundred twenty million, thirty-six thousand, six hundred forty-five".