6447761768 has 32 divisors (see below), whose sum is σ = 14629377600. Its totient is φ = 2600777472.

The previous prime is 6447761753. The next prime is 6447761779. The reversal of 6447761768 is 8671677446.

It is a Harshad number since it is a multiple of its sum of digits (56).

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, 3385478 + ... + 3387381.

It is an arithmetic number, because the mean of its divisors is an integer number (457168050).

Almost surely, 2^6447761768 is an apocalyptic number.

6447761768 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6447761768 is an abundant number, since it is smaller than the sum of its proper divisors (8181615832).

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

6447761768 is a wasteful number, since it uses less digits than its factorization.

6447761768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6772889 (or 6772885 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 56.

The square root of 6447761768 is about 80297.9561881870. The cubic root of 6447761768 is about 1861.2426436246.

The spelling of 6447761768 in words is "six billion, four hundred forty-seven million, seven hundred sixty-one thousand, seven hundred sixty-eight".