6447748656 has 20 divisors (see below), whose sum is σ = 16656684152. Its totient is φ = 2149249536.

The previous prime is 6447748651. The next prime is 6447748679. The reversal of 6447748656 is 6568477446.

It is a junction number, because it is equal to n+sod(n) for n = 6447748596 and 6447748605.

It is not an unprimeable number, because it can be changed into a prime (6447748651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67164001 + ... + 67164096.

Almost surely, 2^6447748656 is an apocalyptic number.

It is an amenable number.

6447748656 is an abundant number, since it is smaller than the sum of its proper divisors (10208935496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6447748656 is a wasteful number, since it uses less digits than its factorization.

6447748656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134328108 (or 134328102 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 57.

The square root of 6447748656 is about 80297.8745422318. The cubic root of 6447748656 is about 1861.2413819656.

The spelling of 6447748656 in words is "six billion, four hundred forty-seven million, seven hundred forty-eight thousand, six hundred fifty-six".