647323747 has 4 divisors (see below), whose sum is σ = 739798576. Its totient is φ = 554848920.

The previous prime is 647323727. The next prime is 647323759. The reversal of 647323747 is 747323746.

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

It is a cyclic number.

It is not a de Polignac number, because 647323747 - 2¹⁵ = 647290979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647323727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46237404 + ... + 46237417.

It is an arithmetic number, because the mean of its divisors is an integer number (184949644).

Almost surely, 2^647323747 is an apocalyptic number.

647323747 is a deficient number, since it is larger than the sum of its proper divisors (92474829).

647323747 is an equidigital number, since it uses as much as digits as its factorization.

647323747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92474828.

The product of its digits is 592704, while the sum is 43.

The square root of 647323747 is about 25442.5577920145. The cubic root of 647323747 is about 865.0486109873.

Subtracting 647323747 from its reverse (747323746), we obtain a palindrome (99999999).

The spelling of 647323747 in words is "six hundred forty-seven million, three hundred twenty-three thousand, seven hundred forty-seven".