647642207 has 2 divisors, whose sum is σ = 647642208. Its totient is φ = 647642206.

The previous prime is 647642197. The next prime is 647642243. The reversal of 647642207 is 702246746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647642207 - 2⁶ = 647642143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647642287) 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 as a sum of consecutive naturals, namely, 323821103 + 323821104.

It is an arithmetic number, because the mean of its divisors is an integer number (323821104).

Almost surely, 2^647642207 is an apocalyptic number.

647642207 is a deficient number, since it is larger than the sum of its proper divisors (1).

647642207 is an equidigital number, since it uses as much as digits as its factorization.

647642207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 38.

The square root of 647642207 is about 25448.8154341219. The cubic root of 647642207 is about 865.1904453313.

The spelling of 647642207 in words is "six hundred forty-seven million, six hundred forty-two thousand, two hundred seven".