520104144 has 40 divisors (see below), whose sum is σ = 1535546560. Its totient is φ = 148601088.

The previous prime is 520104139. The next prime is 520104161. The reversal of 520104144 is 441401025.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 520104144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773629 + ... + 774300.

It is an arithmetic number, because the mean of its divisors is an integer number (38388664).

Almost surely, 2^520104144 is an apocalyptic number.

It is an amenable number.

520104144 is an abundant number, since it is smaller than the sum of its proper divisors (1015442416).

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

520104144 is a wasteful number, since it uses less digits than its factorization.

520104144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547947 (or 1547941 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 520104144 is about 22805.7918959198. The cubic root of 520104144 is about 804.1988320399.

Adding to 520104144 its reverse (441401025), we get a palindrome (961505169).

The spelling of 520104144 in words is "five hundred twenty million, one hundred four thousand, one hundred forty-four".