520784640 has 180 divisors, whose sum is σ = 1863833664. Its totient is φ = 138848256.

The previous prime is 520784629. The next prime is 520784659. The reversal of 520784640 is 46487025.

520784640 is a `hidden beast` number, since 5 + 2 + 0 + 7 + 8 + 4 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 520784595 and 520784604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 101169 + ... + 106191.

Almost surely, 2^520784640 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 520784640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931916832).

520784640 is an abundant number, since it is smaller than the sum of its proper divisors (1343049024).

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

520784640 is an equidigital number, since it uses as much as digits as its factorization.

520784640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5056 (or 5033 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 520784640 is about 22820.7063869636. The cubic root of 520784640 is about 804.5494128452.

The spelling of 520784640 in words is "five hundred twenty million, seven hundred eighty-four thousand, six hundred forty".