520633664 has 56 divisors (see below), whose sum is σ = 1070018688. Its totient is φ = 251182080.

The previous prime is 520633651. The next prime is 520633667. The reversal of 520633664 is 466336025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520633667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218399 + ... + 220769.

Almost surely, 2^520633664 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 520633664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (535009344).

520633664 is an abundant number, since it is smaller than the sum of its proper divisors (549385024).

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

520633664 is a wasteful number, since it uses less digits than its factorization.

520633664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503 (or 2493 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 520633664 is about 22817.3982741241. The cubic root of 520633664 is about 804.4716587650.

Adding to 520633664 its reverse (466336025), we get a palindrome (986969689).

The spelling of 520633664 in words is "five hundred twenty million, six hundred thirty-three thousand, six hundred sixty-four".