520805538 has 90 divisors (see below), whose sum is σ = 1290642507. Its totient is φ = 156851640.

The previous prime is 520805533. The next prime is 520805563. The reversal of 520805538 is 835508025.

520805538 is a `hidden beast` number, since 5 + 20 + 80 + 553 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 260402769 + 260402769 = 16137^2 + 16137^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=16137.

It is a super-2 number, since 2×520805538² = 542476816822938888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (520805531) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 3195045 + ... + 3195207.

Almost surely, 2^520805538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520805538

520805538 is an abundant number, since it is smaller than the sum of its proper divisors (769836969).

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

520805538 is a wasteful number, since it uses less digits than its factorization.

520805538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 520805538 is about 22821.1642560146. The cubic root of 520805538 is about 804.5601743305.

The spelling of 520805538 in words is "five hundred twenty million, eight hundred five thousand, five hundred thirty-eight".