520209816 has 64 divisors (see below), whose sum is σ = 1564550400. Its totient is φ = 140807808.

The previous prime is 520209779. The next prime is 520209817. The reversal of 520209816 is 618902025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520209817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78295 + ... + 84678.

It is an arithmetic number, because the mean of its divisors is an integer number (24446100).

Almost surely, 2^520209816 is an apocalyptic number.

520209816 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

520209816 is an abundant number, since it is smaller than the sum of its proper divisors (1044340584).

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

520209816 is a wasteful number, since it uses less digits than its factorization.

520209816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163008 (or 163004 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 520209816 is about 22808.1085581422. The cubic root of 520209816 is about 804.2532926354.

The spelling of 520209816 in words is "five hundred twenty million, two hundred nine thousand, eight hundred sixteen".