517804804920 has 128 divisors (see below), whose sum is σ = 1673429486400. Its totient is φ = 127419899904.

The previous prime is 517804804889. The next prime is 517804804927. The reversal of 517804804920 is 29408408715.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 517804804920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517804804927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5118186 + ... + 5218374.

Almost surely, 2^517804804920 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 517804804920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (836714743200).

517804804920 is an abundant number, since it is smaller than the sum of its proper divisors (1155624681480).

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

517804804920 is a wasteful number, since it uses less digits than its factorization.

517804804920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103529 (or 103525 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 517804804920 in words is "five hundred seventeen billion, eight hundred four million, eight hundred four thousand, nine hundred twenty".