520440681 has 8 divisors (see below), whose sum is σ = 694113984. Its totient is φ = 346863920.

The previous prime is 520440673. The next prime is 520440691. The reversal of 520440681 is 186044025.

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 520440681 - 2³ = 520440673 is a prime.

It is a super-2 number, since 2×520440681² = 541717004879487522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (520440611) 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, 10446 + ... + 33911.

It is an arithmetic number, because the mean of its divisors is an integer number (86764248).

Almost surely, 2^520440681 is an apocalyptic number.

It is an amenable number.

520440681 is a deficient number, since it is larger than the sum of its proper divisors (173673303).

520440681 is a wasteful number, since it uses less digits than its factorization.

520440681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48271.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 520440681 is about 22813.1690258061. The cubic root of 520440681 is about 804.3722487890.

The spelling of 520440681 in words is "five hundred twenty million, four hundred forty thousand, six hundred eighty-one".