6641856 has 84 divisors (see below), whose sum is σ = 20525232. Its totient is φ = 2041344.

The previous prime is 6641851. The next prime is 6641867. The reversal of 6641856 is 6581466.

6641856 is a `hidden beast` number, since 6 + 641 + 8 + 5 + 6 = 666.

It is a super-2 number, since 2×6641856² = 88228502249472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6641856.

It is not an unprimeable number, because it can be changed into a prime (6641851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7045 + ... + 7931.

It is an arithmetic number, because the mean of its divisors is an integer number (244348).

Almost surely, 2^6641856 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 6641856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10262616).

6641856 is an abundant number, since it is smaller than the sum of its proper divisors (13883376).

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

6641856 is a wasteful number, since it uses less digits than its factorization.

6641856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 905 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 6641856 is about 2577.1798540265. The cubic root of 6641856 is about 187.9734382271.

The spelling of 6641856 in words is "six million, six hundred forty-one thousand, eight hundred fifty-six".