647713679 has 2 divisors, whose sum is σ = 647713680. Its totient is φ = 647713678.

The previous prime is 647713631. The next prime is 647713681. The reversal of 647713679 is 976317746.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647713679 - 2¹⁶ = 647648143 is a prime.

It is a Sophie Germain prime.

Together with 647713681, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647719679) 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, 323856839 + 323856840.

It is an arithmetic number, because the mean of its divisors is an integer number (323856840).

Almost surely, 2^647713679 is an apocalyptic number.

647713679 is a deficient number, since it is larger than the sum of its proper divisors (1).

647713679 is an equidigital number, since it uses as much as digits as its factorization.

647713679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 50.

The square root of 647713679 is about 25450.2196257714. The cubic root of 647713679 is about 865.2222708342. Note that the first 4 decimals are identical.

The spelling of 647713679 in words is "six hundred forty-seven million, seven hundred thirteen thousand, six hundred seventy-nine".