647368723 has 4 divisors (see below), whose sum is σ = 647454928. Its totient is φ = 647282520.

The previous prime is 647368717. The next prime is 647368781. The reversal of 647368723 is 327863746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647368723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647368223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30636 + ... + 47257.

It is an arithmetic number, because the mean of its divisors is an integer number (161863732).

Almost surely, 2^647368723 is an apocalyptic number.

647368723 is a deficient number, since it is larger than the sum of its proper divisors (86205).

647368723 is an equidigital number, since it uses as much as digits as its factorization.

647368723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86204.

The product of its digits is 1016064, while the sum is 46.

The square root of 647368723 is about 25443.4416500598. The cubic root of 647368723 is about 865.0686450251.

It can be divided in two parts, 647368 and 723, that added together give a triangular number (648091 = T₁₁₃₈).

The spelling of 647368723 in words is "six hundred forty-seven million, three hundred sixty-eight thousand, seven hundred twenty-three".