6845220 has 72 divisors (see below), whose sum is σ = 21995064. Its totient is φ = 1717248.

The previous prime is 6845219. The next prime is 6845227. The reversal of 6845220 is 225486.

It can be written as a sum of positive squares in 4 ways, for example, as 2359296 + 4485924 = 1536^2 + 2118^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6845227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1942 + ... + 4178.

It is an arithmetic number, because the mean of its divisors is an integer number (305487).

Almost surely, 2^6845220 is an apocalyptic number.

6845220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6845220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10997532).

6845220 is an abundant number, since it is smaller than the sum of its proper divisors (15149844).

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

6845220 is a wasteful number, since it uses less digits than its factorization.

6845220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2269 (or 2264 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 6845220 is about 2616.3371342394. The cubic root of 6845220 is about 189.8726755448.

The spelling of 6845220 in words is "six million, eight hundred forty-five thousand, two hundred twenty".