647567 has 4 divisors (see below), whose sum is σ = 650496. Its totient is φ = 644640.

The previous prime is 647557. The next prime is 647579. The reversal of 647567 is 765746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 765746 = 2 ⋅382873.

It is a cyclic number.

It is not a de Polignac number, because 647567 - 2⁴ = 647551 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 647567.

It is not an unprimeable number, because it can be changed into a prime (647527) 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, 1103 + ... + 1584.

It is an arithmetic number, because the mean of its divisors is an integer number (162624).

2⁶⁴⁷⁵⁶⁷ is an apocalyptic number.

647567 is a deficient number, since it is larger than the sum of its proper divisors (2929).

647567 is a wasteful number, since it uses less digits than its factorization.

647567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928.

The product of its digits is 35280, while the sum is 35.

The square root of 647567 is about 804.7154776690. The cubic root of 647567 is about 86.5156954156.

The spelling of 647567 in words is "six hundred forty-seven thousand, five hundred sixty-seven".