6447229440 has 80 divisors (see below), whose sum is σ = 20611011168. Its totient is φ = 1719259136.

The previous prime is 6447229427. The next prime is 6447229457. The reversal of 6447229440 is 449227446.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 6447229392 and 6447229401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412062 + ... + 427421.

Almost surely, 2^6447229440 is an apocalyptic number.

6447229440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6447229440 is an abundant number, since it is smaller than the sum of its proper divisors (14163781728).

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

6447229440 is an equidigital number, since it uses as much as digits as its factorization.

6447229440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839509 (or 839493 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 42.

The square root of 6447229440 is about 80294.6414152277. The cubic root of 6447229440 is about 1861.1914207415.

The spelling of 6447229440 in words is "six billion, four hundred forty-seven million, two hundred twenty-nine thousand, four hundred forty".