521040320 has 56 divisors (see below), whose sum is σ = 1243888800. Its totient is φ = 207885312.

The previous prime is 521040283. The next prime is 521040323. The reversal of 521040320 is 23040125.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521040323) 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, 138626 + ... + 142334.

It is an arithmetic number, because the mean of its divisors is an integer number (22212300).

Almost surely, 2^521040320 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 521040320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (621944400).

521040320 is an abundant number, since it is smaller than the sum of its proper divisors (722848480).

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

521040320 is a wasteful number, since it uses less digits than its factorization.

521040320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165 (or 4155 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 521040320 is about 22826.3076295751. The cubic root of 521040320 is about 804.6810562176.

Adding to 521040320 its reverse (23040125), we get a palindrome (544080445).

The spelling of 521040320 in words is "five hundred twenty-one million, forty thousand, three hundred twenty".