647671723 has 2 divisors, whose sum is σ = 647671724. Its totient is φ = 647671722.

The previous prime is 647671721. The next prime is 647671771. The reversal of 647671723 is 327176746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647671723 - 2¹ = 647671721 is a prime.

Together with 647671721, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 647671723.

It is not a weakly prime, because it can be changed into another prime (647671721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323835861 + 323835862.

It is an arithmetic number, because the mean of its divisors is an integer number (323835862).

Almost surely, 2^647671723 is an apocalyptic number.

647671723 is a deficient number, since it is larger than the sum of its proper divisors (1).

647671723 is an equidigital number, since it uses as much as digits as its factorization.

647671723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 43.

The square root of 647671723 is about 25449.3953366283. The cubic root of 647671723 is about 865.2035886857.

The spelling of 647671723 in words is "six hundred forty-seven million, six hundred seventy-one thousand, seven hundred twenty-three".