647322747 has 4 divisors (see below), whose sum is σ = 863097000. Its totient is φ = 431548496.

The previous prime is 647322707. The next prime is 647322751. The reversal of 647322747 is 747223746.

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 647322747 - 2⁷ = 647322619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647322699 and 647322708.

It is not an unprimeable number, because it can be changed into a prime (647322707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107887122 + ... + 107887127.

It is an arithmetic number, because the mean of its divisors is an integer number (215774250).

Almost surely, 2^647322747 is an apocalyptic number.

647322747 is a deficient number, since it is larger than the sum of its proper divisors (215774253).

647322747 is a wasteful number, since it uses less digits than its factorization.

647322747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215774252.

The product of its digits is 395136, while the sum is 42.

The square root of 647322747 is about 25442.5381398948. The cubic root of 647322747 is about 865.0481655383.

Subtracting 647322747 from its reverse (747223746), we obtain a palindrome (99900999).

The spelling of 647322747 in words is "six hundred forty-seven million, three hundred twenty-two thousand, seven hundred forty-seven".