647468641 has 4 divisors (see below), whose sum is σ = 655269552. Its totient is φ = 639667732.

The previous prime is 647468629. The next prime is 647468683. The reversal of 647468641 is 146864746.

647468641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647468641 - 2¹¹ = 647466593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647468591 and 647468600.

It is not an unprimeable number, because it can be changed into a prime (647468621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3900331 + ... + 3900496.

It is an arithmetic number, because the mean of its divisors is an integer number (163817388).

Almost surely, 2^647468641 is an apocalyptic number.

It is an amenable number.

647468641 is a deficient number, since it is larger than the sum of its proper divisors (7800911).

647468641 is an equidigital number, since it uses as much as digits as its factorization.

647468641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7800910.

The product of its digits is 774144, while the sum is 46.

The square root of 647468641 is about 25445.4051058339. The cubic root of 647468641 is about 865.1131490196.

The spelling of 647468641 in words is "six hundred forty-seven million, four hundred sixty-eight thousand, six hundred forty-one".