520005223812 has 24 divisors (see below), whose sum is σ = 1225854241696. Its totient is φ = 171548114688.

The previous prime is 520005223789. The next prime is 520005223813. The reversal of 520005223812 is 218322500025.

It is a super-2 number, since 2×520005223812² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 520005223812.

It is not an unprimeable number, because it can be changed into a prime (520005223813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223368778 + ... + 223371105.

Almost surely, 2^520005223812 is an apocalyptic number.

It is an amenable number.

520005223812 is an abundant number, since it is smaller than the sum of its proper divisors (705849017884).

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

520005223812 is a wasteful number, since it uses less digits than its factorization.

520005223812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446739987 (or 446739985 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 520005223812 its reverse (218322500025), we get a palindrome (738327723837).

The spelling of 520005223812 in words is "five hundred twenty billion, five million, two hundred twenty-three thousand, eight hundred twelve".