521620204 has 48 divisors (see below), whose sum is σ = 1078410816. Its totient is φ = 216115200.

The previous prime is 521620201. The next prime is 521620249. The reversal of 521620204 is 402026125.

It is not an unprimeable number, because it can be changed into a prime (521620201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127714 + ... + 131734.

It is an arithmetic number, because the mean of its divisors is an integer number (22466892).

Almost surely, 2^521620204 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 521620204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (539205408).

521620204 is an abundant number, since it is smaller than the sum of its proper divisors (556790612).

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

521620204 is a wasteful number, since it uses less digits than its factorization.

521620204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4186 (or 4184 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 521620204 is about 22839.0061955419. The cubic root of 521620204 is about 804.9794647746.

Adding to 521620204 its reverse (402026125), we get a palindrome (923646329).

The spelling of 521620204 in words is "five hundred twenty-one million, six hundred twenty thousand, two hundred four".