520643760 has 320 divisors, whose sum is σ = 2053201920. Its totient is φ = 106168320.

The previous prime is 520643749. The next prime is 520643797. The reversal of 520643760 is 67346025.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 676656 + ... + 677424.

It is an arithmetic number, because the mean of its divisors is an integer number (6416256).

Almost surely, 2^520643760 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520643760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1026600960).

520643760 is an abundant number, since it is smaller than the sum of its proper divisors (1532558160).

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

520643760 is a wasteful number, since it uses less digits than its factorization.

520643760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 520643760 is about 22817.6195077401. The cubic root of 520643760 is about 804.4768587703.

Adding to 520643760 its reverse (67346025), we get a palindrome (587989785).

The spelling of 520643760 in words is "five hundred twenty million, six hundred forty-three thousand, seven hundred sixty".