647646071 has 8 divisors (see below), whose sum is σ = 649935504. Its totient is φ = 645361920.

The previous prime is 647646049. The next prime is 647646119. The reversal of 647646071 is 170646746.

It is a happy number.

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 647646071 - 2¹⁸ = 647383927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647646371) 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 7 ways as a sum of consecutive naturals, for example, 609881 + ... + 610941.

It is an arithmetic number, because the mean of its divisors is an integer number (81241938).

Almost surely, 2^647646071 is an apocalyptic number.

647646071 is a deficient number, since it is larger than the sum of its proper divisors (2289433).

647646071 is a wasteful number, since it uses less digits than its factorization.

647646071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2641.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 647646071 is about 25448.8913510982. The cubic root of 647646071 is about 865.1921659774.

The spelling of 647646071 in words is "six hundred forty-seven million, six hundred forty-six thousand, seventy-one".