647872723 has 2 divisors, whose sum is σ = 647872724. Its totient is φ = 647872722.

The previous prime is 647872699. The next prime is 647872733. The reversal of 647872723 is 327278746.

It is a happy number.

647872723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647872723 - 2²⁹ = 111001811 is a prime.

It is not a weakly prime, because it can be changed into another prime (647872733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323936361 + 323936362.

It is an arithmetic number, because the mean of its divisors is an integer number (323936362).

Almost surely, 2^647872723 is an apocalyptic number.

647872723 is a deficient number, since it is larger than the sum of its proper divisors (1).

647872723 is an equidigital number, since it uses as much as digits as its factorization.

647872723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 790272, while the sum is 46.

The square root of 647872723 is about 25453.3440435633. The cubic root of 647872723 is about 865.2930825492.

It can be divided in two parts, 64 and 7872723, that added together give a palindrome (7872787).

The spelling of 647872723 in words is "six hundred forty-seven million, eight hundred seventy-two thousand, seven hundred twenty-three".