647681368 has 24 divisors (see below), whose sum is σ = 1290044700. Its totient is φ = 304790144.

The previous prime is 647681299. The next prime is 647681369. The reversal of 647681368 is 863186746.

647681368 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647681369) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 137758 + ... + 142381.

Almost surely, 2^647681368 is an apocalyptic number.

647681368 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

647681368 is a deficient number, since it is larger than the sum of its proper divisors (642363332).

647681368 is a wasteful number, since it uses less digits than its factorization.

647681368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280179 (or 280158 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 49.

The square root of 647681368 is about 25449.5848296195. The cubic root of 647681368 is about 865.2078834783.

The spelling of 647681368 in words is "six hundred forty-seven million, six hundred eighty-one thousand, three hundred sixty-eight".