647585 has 4 divisors (see below), whose sum is σ = 777108. Its totient is φ = 518064.

The previous prime is 647579. The next prime is 647587. The reversal of 647585 is 585746.

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

It can be written as a sum of positive squares in 2 ways, for example, as 351649 + 295936 = 593^2 + 544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647585 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647585.

It is not an unprimeable number, because it can be changed into a prime (647587) 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, 64754 + ... + 64763.

It is an arithmetic number, because the mean of its divisors is an integer number (194277).

2⁶⁴⁷⁵⁸⁵ is an apocalyptic number.

It is an amenable number.

647585 is a deficient number, since it is larger than the sum of its proper divisors (129523).

647585 is a wasteful number, since it uses less digits than its factorization.

647585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129522.

The product of its digits is 33600, while the sum is 35.

The square root of 647585 is about 804.7266616684. The cubic root of 647585 is about 86.5164970150.

The spelling of 647585 in words is "six hundred forty-seven thousand, five hundred eighty-five".