647713609 has 4 divisors (see below), whose sum is σ = 654991380. Its totient is φ = 640435840.

The previous prime is 647713567. The next prime is 647713621. The reversal of 647713609 is 906317746.

647713609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 282139209 + 365574400 = 16797^2 + 19120^2 .

It is a cyclic number.

It is not a de Polignac number, because 647713609 - 2¹³ = 647705417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647713679) 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, 3638752 + ... + 3638929.

It is an arithmetic number, because the mean of its divisors is an integer number (163747845).

Almost surely, 2^647713609 is an apocalyptic number.

It is an amenable number.

647713609 is a deficient number, since it is larger than the sum of its proper divisors (7277771).

647713609 is an equidigital number, since it uses as much as digits as its factorization.

647713609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7277770.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 647713609 is about 25450.2182505377. The cubic root of 647713609 is about 865.2222396653. Note that the first 4 decimals are identical.

The spelling of 647713609 in words is "six hundred forty-seven million, seven hundred thirteen thousand, six hundred nine".