520785720 has 384 divisors, whose sum is σ = 2177582400. Its totient is φ = 109734912.

The previous prime is 520785719. The next prime is 520785721. The reversal of 520785720 is 27587025.

It is an interprime number because it is at equal distance from previous prime (520785719) and next prime (520785721).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520785721) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 687582 + ... + 688338.

Almost surely, 2^520785720 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 520785720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088791200).

520785720 is an abundant number, since it is smaller than the sum of its proper divisors (1656796680).

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

520785720 is a wasteful number, since it uses less digits than its factorization.

520785720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 520785720 is about 22820.7300496719. The cubic root of 520785720 is about 804.5499690013.

The spelling of 520785720 in words is "five hundred twenty million, seven hundred eighty-five thousand, seven hundred twenty".