520346647 has 4 divisors (see below), whose sum is σ = 525498696. Its totient is φ = 515194600.

The previous prime is 520346609. The next prime is 520346663. The reversal of 520346647 is 746643025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520346647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520346677) 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, 2575873 + ... + 2576074.

It is an arithmetic number, because the mean of its divisors is an integer number (131374674).

Almost surely, 2^520346647 is an apocalyptic number.

520346647 is a deficient number, since it is larger than the sum of its proper divisors (5152049).

520346647 is a wasteful number, since it uses less digits than its factorization.

520346647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5152048.

The product of its (nonzero) digits is 120960, while the sum is 37.

The square root of 520346647 is about 22811.1079739674. The cubic root of 520346647 is about 804.3238008110.

The spelling of 520346647 in words is "five hundred twenty million, three hundred forty-six thousand, six hundred forty-seven".