647208242 has 6 divisors (see below), whose sum is σ = 970866333. Its totient is φ = 323586132.

The previous prime is 647208227. The next prime is 647208253. The reversal of 647208242 is 242802746.

It is a happy number.

647208242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 594920881 + 52287361 = 24391^2 + 7231^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17989.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 26984 + ... + 44972.

Almost surely, 2^647208242 is an apocalyptic number.

647208242 is a deficient number, since it is larger than the sum of its proper divisors (323658091).

647208242 is an frugal number, since it uses more digits than its factorization.

647208242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35980 (or 17991 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 647208242 is about 25440.2877735296. The cubic root of 647208242 is about 864.9971563719.

The spelling of 647208242 in words is "six hundred forty-seven million, two hundred eight thousand, two hundred forty-two".