647949673 has 8 divisors (see below), whose sum is σ = 741815360. Its totient is φ = 554409360.

The previous prime is 647949667. The next prime is 647949677. The reversal of 647949673 is 376949746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647949673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647949677) 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, 77058 + ... + 85051.

It is an arithmetic number, because the mean of its divisors is an integer number (92726920).

Almost surely, 2^647949673 is an apocalyptic number.

It is an amenable number.

647949673 is a deficient number, since it is larger than the sum of its proper divisors (93865687).

647949673 is a wasteful number, since it uses less digits than its factorization.

647949673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162687.

The product of its digits is 6858432, while the sum is 55.

The square root of 647949673 is about 25454.8555878834. The cubic root of 647949673 is about 865.3273391063.

The spelling of 647949673 in words is "six hundred forty-seven million, nine hundred forty-nine thousand, six hundred seventy-three".