521543680 has 224 divisors, whose sum is σ = 1528730496. Its totient is φ = 166723584.

The previous prime is 521543669. The next prime is 521543719. The reversal of 521543680 is 86345125.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4874187 + ... + 4874293.

Almost surely, 2^521543680 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 521543680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764365248).

521543680 is an abundant number, since it is smaller than the sum of its proper divisors (1007186816).

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

521543680 is a wasteful number, since it uses less digits than its factorization.

521543680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 521543680 is about 22837.3308422854. The cubic root of 521543680 is about 804.9400981622.

The spelling of 521543680 in words is "five hundred twenty-one million, five hundred forty-three thousand, six hundred eighty".