520841664 has 280 divisors, whose sum is σ = 1825353728. Its totient is φ = 143700480.

The previous prime is 520841663. The next prime is 520841669. The reversal of 520841664 is 466148025.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520841663) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1124697 + ... + 1125159.

Almost surely, 2^520841664 is an apocalyptic number.

520841664 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520841664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (912676864).

520841664 is an abundant number, since it is smaller than the sum of its proper divisors (1304512064).

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

520841664 is a wasteful number, since it uses less digits than its factorization.

520841664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 520841664 is about 22821.9557444142. The cubic root of 520841664 is about 804.5787768393.

Adding to 520841664 its reverse (466148025), we get a palindrome (986989689).

The spelling of 520841664 in words is "five hundred twenty million, eight hundred forty-one thousand, six hundred sixty-four".