647929679 has 2 divisors, whose sum is σ = 647929680. Its totient is φ = 647929678.

The previous prime is 647929673. The next prime is 647929699. The reversal of 647929679 is 976929746.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647929679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647929673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323964839 + 323964840.

It is an arithmetic number, because the mean of its divisors is an integer number (323964840).

Almost surely, 2^647929679 is an apocalyptic number.

647929679 is a deficient number, since it is larger than the sum of its proper divisors (1).

647929679 is an equidigital number, since it uses as much as digits as its factorization.

647929679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 59.

The square root of 647929679 is about 25454.4628503530. The cubic root of 647929679 is about 865.3184384496.

The spelling of 647929679 in words is "six hundred forty-seven million, nine hundred twenty-nine thousand, six hundred seventy-nine".