647009 has 8 divisors (see below), whose sum is σ = 712800. Its totient is φ = 582400.

The previous prime is 646993. The next prime is 647011. The reversal of 647009 is 900746.

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 647009 - 2⁴ = 646993 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647009.

It is not an unprimeable number, because it can be changed into a prime (647039) 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, 1217 + ... + 1665.

It is an arithmetic number, because the mean of its divisors is an integer number (89100).

2⁶⁴⁷⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

647009 is a deficient number, since it is larger than the sum of its proper divisors (65791).

647009 is a wasteful number, since it uses less digits than its factorization.

647009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 647009 is about 804.3686965565. The cubic root of 647009 is about 86.4908384608.

The spelling of 647009 in words is "six hundred forty-seven thousand, nine".