6447686280 has 128 divisors (see below), whose sum is σ = 22819553280. Its totient is φ = 1426210560.

The previous prime is 6447686269. The next prime is 6447686291. The reversal of 6447686280 is 826867446.

It is an interprime number because it is at equal distance from previous prime (6447686269) and next prime (6447686291).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 97764 + ... + 149843.

It is an arithmetic number, because the mean of its divisors is an integer number (178277760).

Almost surely, 2^6447686280 is an apocalyptic number.

6447686280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6447686280 is an abundant number, since it is smaller than the sum of its proper divisors (16371867000).

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

6447686280 is a wasteful number, since it uses less digits than its factorization.

6447686280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247659 (or 247655 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 51.

The square root of 6447686280 is about 80297.4861374875. The cubic root of 6447686280 is about 1861.2353800170.

The spelling of 6447686280 in words is "six billion, four hundred forty-seven million, six hundred eighty-six thousand, two hundred eighty".