6681220 has 48 divisors (see below), whose sum is σ = 17273088. Its totient is φ = 2113920.

The previous prime is 6681209. The next prime is 6681239. The reversal of 6681220 is 221866.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16 + ... + 3655.

It is an arithmetic number, because the mean of its divisors is an integer number (359856).

Almost surely, 2^6681220 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 6681220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8636544).

6681220 is an abundant number, since it is smaller than the sum of its proper divisors (10591868).

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

6681220 is a wasteful number, since it uses less digits than its factorization.

6681220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700 (or 3698 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 6681220 is about 2584.8056019747. The cubic root of 6681220 is about 188.3440583515.

The spelling of 6681220 in words is "six million, six hundred eighty-one thousand, two hundred twenty".