521606464 has 56 divisors (see below), whose sum is σ = 1070213760. Its totient is φ = 252043776.

The previous prime is 521606453. The next prime is 521606467. The reversal of 521606464 is 464606125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521606467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394797 + ... + 396115.

It is an arithmetic number, because the mean of its divisors is an integer number (19110960).

Almost surely, 2^521606464 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 521606464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (535106880).

521606464 is an abundant number, since it is smaller than the sum of its proper divisors (548607296).

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

521606464 is a wasteful number, since it uses less digits than its factorization.

521606464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535 (or 1525 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 521606464 is about 22838.7053923816. The cubic root of 521606464 is about 804.9723967233.

The spelling of 521606464 in words is "five hundred twenty-one million, six hundred six thousand, four hundred sixty-four".