647218468 has 12 divisors (see below), whose sum is σ = 1219757980. Its totient is φ = 298716192.

The previous prime is 647218447. The next prime is 647218471. The reversal of 647218468 is 864812746.

It can be written as a sum of positive squares in 2 ways, for example, as 412577344 + 234641124 = 20312^2 + 15318^2 .

It is an unprimeable number.

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, 6223203 + ... + 6223306.

Almost surely, 2^647218468 is an apocalyptic number.

It is an amenable number.

647218468 is a deficient number, since it is larger than the sum of its proper divisors (572539512).

647218468 is a wasteful number, since it uses less digits than its factorization.

647218468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12446526 (or 12446524 counting only the distinct ones).

The product of its digits is 516096, while the sum is 46.

The square root of 647218468 is about 25440.4887531667. The cubic root of 647218468 is about 865.0017120485.

The spelling of 647218468 in words is "six hundred forty-seven million, two hundred eighteen thousand, four hundred sixty-eight".