520638845 has 4 divisors (see below), whose sum is σ = 624766620. Its totient is φ = 416511072.

The previous prime is 520638841. The next prime is 520638871. The reversal of 520638845 is 548836025.

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 71453209 + 449185636 = 8453^2 + 21194^2 .

It is a cyclic number.

It is not a de Polignac number, because 520638845 - 2² = 520638841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520638841) 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, 52063880 + ... + 52063889.

It is an arithmetic number, because the mean of its divisors is an integer number (156191655).

Almost surely, 2^520638845 is an apocalyptic number.

It is an amenable number.

520638845 is a deficient number, since it is larger than the sum of its proper divisors (104127775).

520638845 is a wasteful number, since it uses less digits than its factorization.

520638845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104127774.

The product of its (nonzero) digits is 230400, while the sum is 41.

The square root of 520638845 is about 22817.5118056286. The cubic root of 520638845 is about 804.4743272785.

The spelling of 520638845 in words is "five hundred twenty million, six hundred thirty-eight thousand, eight hundred forty-five".