6447641252 has 24 divisors (see below), whose sum is σ = 12157399800. Its totient is φ = 2974346496.

The previous prime is 6447641251. The next prime is 6447641293. The reversal of 6447641252 is 2521467446.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 389509696 + 6058131556 = 19736^2 + 77834^2 .

It is not an unprimeable number, because it can be changed into a prime (6447641251) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 77624 + ... + 137552.

It is an arithmetic number, because the mean of its divisors is an integer number (506558325).

Almost surely, 2^6447641252 is an apocalyptic number.

It is an amenable number.

6447641252 is a deficient number, since it is larger than the sum of its proper divisors (5709758548).

6447641252 is a wasteful number, since it uses less digits than its factorization.

6447641252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62015 (or 62013 counting only the distinct ones).

The product of its digits is 322560, while the sum is 41.

The square root of 6447641252 is about 80297.2057546214. The cubic root of 6447641252 is about 1861.2310473051.

The spelling of 6447641252 in words is "six billion, four hundred forty-seven million, six hundred forty-one thousand, two hundred fifty-two".