647713279 has 8 divisors (see below), whose sum is σ = 652354560. Its totient is φ = 643085400.

The previous prime is 647713273. The next prime is 647713291. The reversal of 647713279 is 972317746.

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

It is a cyclic number.

It is not a de Polignac number, because 647713279 - 2¹⁹ = 647188991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647713273) 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 in 7 ways as a sum of consecutive naturals, for example, 106092 + ... + 112030.

It is an arithmetic number, because the mean of its divisors is an integer number (81544320).

Almost surely, 2^647713279 is an apocalyptic number.

647713279 is a deficient number, since it is larger than the sum of its proper divisors (4641281).

647713279 is a wasteful number, since it uses less digits than its factorization.

647713279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6701.

The product of its digits is 444528, while the sum is 46.

The square root of 647713279 is about 25450.2117672918. The cubic root of 647713279 is about 865.2220927262. Note that the first 3 decimals are identical.

The spelling of 647713279 in words is "six hundred forty-seven million, seven hundred thirteen thousand, two hundred seventy-nine".