647312671 has 8 divisors (see below), whose sum is σ = 650157200. Its totient is φ = 644474880.

The previous prime is 647312651. The next prime is 647312711. The reversal of 647312671 is 176213746.

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 647312671 - 2¹¹ = 647310623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647312671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647312641) 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, 290341 + ... + 292561.

It is an arithmetic number, because the mean of its divisors is an integer number (81269650).

Almost surely, 2^647312671 is an apocalyptic number.

647312671 is a deficient number, since it is larger than the sum of its proper divisors (2844529).

647312671 is a wasteful number, since it uses less digits than its factorization.

647312671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3369.

The product of its digits is 42336, while the sum is 37.

The square root of 647312671 is about 25442.3401242889. The cubic root of 647312671 is about 865.0436771691.

The spelling of 647312671 in words is "six hundred forty-seven million, three hundred twelve thousand, six hundred seventy-one".