6421673968 has 40 divisors (see below), whose sum is σ = 13027478688. Its totient is φ = 3060701952.

The previous prime is 6421673953. The next prime is 6421673969. The reversal of 6421673968 is 8693761246.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421673969) 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, 78046 + ... + 137602.

Almost surely, 2^6421673968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6421673968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6513739344).

6421673968 is an abundant number, since it is smaller than the sum of its proper divisors (6605804720).

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

6421673968 is a wasteful number, since it uses less digits than its factorization.

6421673968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59881 (or 59875 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 52.

The square root of 6421673968 is about 80135.3478060712. The cubic root of 6421673968 is about 1858.7290396245.

The spelling of 6421673968 in words is "six billion, four hundred twenty-one million, six hundred seventy-three thousand, nine hundred sixty-eight".