6421780848 has 120 divisors (see below), whose sum is σ = 19325608320. Its totient is φ = 1832181120.

The previous prime is 6421780829. The next prime is 6421780853. The reversal of 6421780848 is 8480871246.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 6421780797 and 6421780806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2160003 + ... + 2162973.

It is an arithmetic number, because the mean of its divisors is an integer number (161046736).

Almost surely, 2^6421780848 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 6421780848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9662804160).

6421780848 is an abundant number, since it is smaller than the sum of its proper divisors (12903827472).

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

6421780848 is a wasteful number, since it uses less digits than its factorization.

6421780848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3915 (or 3902 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 48.

The square root of 6421780848 is about 80136.0146750511. The cubic root of 6421780848 is about 1858.7393515700.

The spelling of 6421780848 in words is "six billion, four hundred twenty-one million, seven hundred eighty thousand, eight hundred forty-eight".