520328729 has 4 divisors (see below), whose sum is σ = 529147920. Its totient is φ = 511509540.

The previous prime is 520328723. The next prime is 520328749. The reversal of 520328729 is 927823025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520328729 - 2⁴ = 520328713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520328692 and 520328701.

It is not an unprimeable number, because it can be changed into a prime (520328723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4409507 + ... + 4409624.

It is an arithmetic number, because the mean of its divisors is an integer number (132286980).

Almost surely, 2^520328729 is an apocalyptic number.

520328729 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

520328729 is a deficient number, since it is larger than the sum of its proper divisors (8819191).

520328729 is an equidigital number, since it uses as much as digits as its factorization.

520328729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8819190.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 520328729 is about 22810.7152233331. The cubic root of 520328729 is about 804.3145684788.

The spelling of 520328729 in words is "five hundred twenty million, three hundred twenty-eight thousand, seven hundred twenty-nine".