647856008 has 12 divisors (see below), whose sum is σ = 1214865015. Its totient is φ = 323892008.

The previous prime is 647855933. The next prime is 647856061. The reversal of 647856008 is 800658746.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 323928004 + 323928004 = 17998^2 + 17998^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17998.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647856008.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 67493 + ... + 76491.

Almost surely, 2^647856008 is an apocalyptic number.

It is an amenable number.

647856008 is a deficient number, since it is larger than the sum of its proper divisors (567009007).

647856008 is an frugal number, since it uses more digits than its factorization.

647856008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18004 (or 9001 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 647856008 is about 25453.0156955910. The cubic root of 647856008 is about 865.2856410164.

The spelling of 647856008 in words is "six hundred forty-seven million, eight hundred fifty-six thousand, eight".