520005780 has 144 divisors (see below), whose sum is σ = 1860977664. Its totient is φ = 115015680.

The previous prime is 520005743. The next prime is 520005799. The reversal of 520005780 is 87500025.

It is a happy number.

It is a super-2 number, since 2×520005780² = 540812022466816800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32404 + ... + 45716.

It is an arithmetic number, because the mean of its divisors is an integer number (12923456).

Almost surely, 2^520005780 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 520005780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (930488832).

520005780 is an abundant number, since it is smaller than the sum of its proper divisors (1340971884).

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

520005780 is a wasteful number, since it uses less digits than its factorization.

520005780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13366 (or 13361 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 520005780 is about 22803.6352365144. The cubic root of 520005780 is about 804.1481311677.

The spelling of 520005780 in words is "five hundred twenty million, five thousand, seven hundred eighty".