647071 has 6 divisors (see below), whose sum is σ = 687680. Its totient is φ = 608736.

The previous prime is 647069. The next prime is 647081. The reversal of 647071 is 170746.

647071 is nontrivially palindromic in base 7.

It is not a de Polignac number, because 647071 - 2¹ = 647069 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 831 + ... + 1408.

2⁶⁴⁷⁰⁷¹ is an apocalyptic number.

647071 is a deficient number, since it is larger than the sum of its proper divisors (40609).

647071 is a wasteful number, since it uses less digits than its factorization.

647071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273 (or 2256 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 647071 is about 804.4072351738. The cubic root of 647071 is about 86.4936010502.

The spelling of 647071 in words is "six hundred forty-seven thousand, seventy-one".