521434320 has 160 divisors (see below), whose sum is σ = 1772457984. Its totient is φ = 125760000.

The previous prime is 521434313. The next prime is 521434321. The reversal of 521434320 is 23434125.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521434321) 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, 693945 + ... + 694695.

Almost surely, 2^521434320 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 521434320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886228992).

521434320 is an abundant number, since it is smaller than the sum of its proper divisors (1251023664).

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

521434320 is a wasteful number, since it uses less digits than its factorization.

521434320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 521434320 is about 22834.9363914157. The cubic root of 521434320 is about 804.8838328828.

Adding to 521434320 its reverse (23434125), we get a palindrome (544868445).

The spelling of 521434320 in words is "five hundred twenty-one million, four hundred thirty-four thousand, three hundred twenty".