517889868 has 12 divisors (see below), whose sum is σ = 1208409720. Its totient is φ = 172629952.

The previous prime is 517889863. The next prime is 517889891. The reversal of 517889868 is 868988715.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (517889861) 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 3 ways as a sum of consecutive naturals, for example, 21578733 + ... + 21578756.

It is an arithmetic number, because the mean of its divisors is an integer number (100700810).

Almost surely, 2^517889868 is an apocalyptic number.

It is an amenable number.

517889868 is an abundant number, since it is smaller than the sum of its proper divisors (690519852).

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

517889868 is a wasteful number, since it uses less digits than its factorization.

517889868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43157496 (or 43157494 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 60.

The square root of 517889868 is about 22757.1937637311. The cubic root of 517889868 is about 803.0559511723.

The spelling of 517889868 in words is "five hundred seventeen million, eight hundred eighty-nine thousand, eight hundred sixty-eight".