520220064 has 288 divisors, whose sum is σ = 1756774656. Its totient is φ = 133539840.

The previous prime is 520220039. The next prime is 520220081. The reversal of 520220064 is 460022025.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 520220064.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2874054 + ... + 2874234.

It is an arithmetic number, because the mean of its divisors is an integer number (6099912).

Almost surely, 2^520220064 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 520220064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (878387328).

520220064 is an abundant number, since it is smaller than the sum of its proper divisors (1236554592).

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

520220064 is a wasteful number, since it uses less digits than its factorization.

520220064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 520220064 is about 22808.3332139812. Note that the first 3 decimals coincide. The cubic root of 520220064 is about 804.2585737953.

Adding to 520220064 its reverse (460022025), we get a palindrome (980242089).

The spelling of 520220064 in words is "five hundred twenty million, two hundred twenty thousand, sixty-four".