6378820 has 72 divisors (see below), whose sum is σ = 16317504. Its totient is φ = 2084544.

The previous prime is 6378787. The next prime is 6378847. The reversal of 6378820 is 288736.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22399 + ... + 22681.

It is an arithmetic number, because the mean of its divisors is an integer number (226632).

Almost surely, 2^6378820 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 6378820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8158752).

6378820 is an abundant number, since it is smaller than the sum of its proper divisors (9938684).

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

6378820 is a wasteful number, since it uses less digits than its factorization.

6378820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 6378820 is about 2525.6325940247. The cubic root of 6378820 is about 185.4585168898.

The spelling of 6378820 in words is "six million, three hundred seventy-eight thousand, eight hundred twenty".