520005781 has 8 divisors (see below), whose sum is σ = 543150720. Its totient is φ = 496905552.

The previous prime is 520005743. The next prime is 520005799. The reversal of 520005781 is 187500025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 520005781 - 2⁷ = 520005653 is a prime.

It is a super-2 number, since 2×520005781² = 540812024546839922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520005701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13815 + ... + 35083.

It is an arithmetic number, because the mean of its divisors is an integer number (67893840).

Almost surely, 2^520005781 is an apocalyptic number.

It is an amenable number.

520005781 is a deficient number, since it is larger than the sum of its proper divisors (23144939).

520005781 is a wasteful number, since it uses less digits than its factorization.

520005781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22355.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 520005781 is about 22803.6352584407. The cubic root of 520005781 is about 804.1481316831.

The spelling of 520005781 in words is "five hundred twenty million, five thousand, seven hundred eighty-one".