647317 has 8 divisors (see below), whose sum is σ = 715680. Its totient is φ = 580560.

The previous prime is 647303. The next prime is 647321. The reversal of 647317 is 713746.

647317 = 44² + 45² + ... + 126².

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 647317 - 2⁷ = 647189 is a prime.

It is a Duffinian number.

647317 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647327) 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, 559 + ... + 1267.

It is an arithmetic number, because the mean of its divisors is an integer number (89460).

2⁶⁴⁷³¹⁷ is an apocalyptic number.

It is an amenable number.

647317 is a deficient number, since it is larger than the sum of its proper divisors (68363).

647317 is a wasteful number, since it uses less digits than its factorization.

647317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803.

The product of its digits is 3528, while the sum is 28.

The square root of 647317 is about 804.5601282689. The cubic root of 647317 is about 86.5045605534.

It can be divided in two parts, 64 and 7317, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 647317 in words is "six hundred forty-seven thousand, three hundred seventeen".