6844640 has 48 divisors (see below), whose sum is σ = 17645040. Its totient is φ = 2488320.

The previous prime is 6844637. The next prime is 6844687. The reversal of 6844640 is 464486.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 6844597 and 6844606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185 + ... + 3704.

It is an arithmetic number, because the mean of its divisors is an integer number (367605).

Almost surely, 2^6844640 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 6844640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8822520).

6844640 is an abundant number, since it is smaller than the sum of its proper divisors (10800400).

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

6844640 is a wasteful number, since it uses less digits than its factorization.

6844640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3915 (or 3907 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 6844640 is about 2616.2262899069. The cubic root of 6844640 is about 189.8673127143.

It can be divided in two parts, 68446 and 40, that added together give a palindrome (68486).

The spelling of 6844640 in words is "six million, eight hundred forty-four thousand, six hundred forty".