6447656472 has 32 divisors (see below), whose sum is σ = 16121646000. Its totient is φ = 2148884864.

The previous prime is 6447656461. The next prime is 6447656477. The reversal of 6447656472 is 2746567446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447656477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173878 + ... + 207674.

Almost surely, 2^6447656472 is an apocalyptic number.

It is an amenable number.

6447656472 is an abundant number, since it is smaller than the sum of its proper divisors (9673989528).

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

6447656472 is a wasteful number, since it uses less digits than its factorization.

6447656472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41755 (or 41751 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 51.

The square root of 6447656472 is about 80297.3005274773. The cubic root of 6447656472 is about 1861.2325118156.

The spelling of 6447656472 in words is "six billion, four hundred forty-seven million, six hundred fifty-six thousand, four hundred seventy-two".