520656864 has 192 divisors, whose sum is σ = 1700891136. Its totient is φ = 135788544.

The previous prime is 520656803. The next prime is 520656869. The reversal of 520656864 is 468656025.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520656869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 934474 + ... + 935030.

It is an arithmetic number, because the mean of its divisors is an integer number (8858808).

Almost surely, 2^520656864 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 520656864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850445568).

520656864 is an abundant number, since it is smaller than the sum of its proper divisors (1180234272).

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

520656864 is a wasteful number, since it uses less digits than its factorization.

520656864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 520656864 is about 22817.9066524517. The cubic root of 520656864 is about 804.4836079637.

The spelling of 520656864 in words is "five hundred twenty million, six hundred fifty-six thousand, eight hundred sixty-four".