647711 has 4 divisors (see below), whose sum is σ = 649800. Its totient is φ = 645624.

The previous prime is 647693. The next prime is 647719. The reversal of 647711 is 117746.

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

It is a cyclic number.

It is not a de Polignac number, because 647711 - 2¹⁰ = 646687 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 (647719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476 + ... + 1233.

It is an arithmetic number, because the mean of its divisors is an integer number (162450).

2⁶⁴⁷⁷¹¹ is an apocalyptic number.

647711 is a deficient number, since it is larger than the sum of its proper divisors (2089).

647711 is a wasteful number, since it uses less digits than its factorization.

647711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088.

The product of its digits is 1176, while the sum is 26.

The square root of 647711 is about 804.8049453128. The cubic root of 647711 is about 86.5221077954.

The spelling of 647711 in words is "six hundred forty-seven thousand, seven hundred eleven".