647717 has 8 divisors (see below), whose sum is σ = 783936. Its totient is φ = 522432.

The previous prime is 647693. The next prime is 647719. The reversal of 647717 is 717746.

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 647717 - 2¹⁶ = 582181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647717.

It is not an unprimeable number, because it can be changed into a prime (647719) 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, 2603 + ... + 2840.

It is an arithmetic number, because the mean of its divisors is an integer number (97992).

2⁶⁴⁷⁷¹⁷ is an apocalyptic number.

It is an amenable number.

647717 is a deficient number, since it is larger than the sum of its proper divisors (136219).

647717 is a wasteful number, since it uses less digits than its factorization.

647717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5467.

The product of its digits is 8232, while the sum is 32.

The square root of 647717 is about 804.8086729155. The cubic root of 647717 is about 86.5223749573.

The spelling of 647717 in words is "six hundred forty-seven thousand, seven hundred seventeen".