521620216 has 64 divisors (see below), whose sum is σ = 1101441600. Its totient is φ = 229920768.

The previous prime is 521620201. The next prime is 521620249. The reversal of 521620216 is 612026125.

It is a congruent number.

It is an unprimeable number.

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, 291661 + ... + 293443.

It is an arithmetic number, because the mean of its divisors is an integer number (17210025).

Almost surely, 2^521620216 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 521620216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (550720800).

521620216 is an abundant number, since it is smaller than the sum of its proper divisors (579821384).

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

521620216 is a wasteful number, since it uses less digits than its factorization.

521620216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928 (or 1924 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 521620216 is about 22839.0064582503. The cubic root of 521620216 is about 804.9794709475.

The spelling of 521620216 in words is "five hundred twenty-one million, six hundred twenty thousand, two hundred sixteen".