6648840 has 192 divisors, whose sum is σ = 24935040. Its totient is φ = 1520640.

The previous prime is 6648839. The next prime is 6648883. The reversal of 6648840 is 488466.

6648840 is a `hidden beast` number, since 6 + 648 + 8 + 4 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 6648795 and 6648804.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91044 + ... + 91116.

It is an arithmetic number, because the mean of its divisors is an integer number (129870).

Almost surely, 2^6648840 is an apocalyptic number.

6648840 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 6648840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12467520).

6648840 is an abundant number, since it is smaller than the sum of its proper divisors (18286200).

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

6648840 is a wasteful number, since it uses less digits than its factorization.

6648840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 6648840 is about 2578.5344674834. The cubic root of 6648840 is about 188.0393006717.

It can be divided in two parts, 6 and 648840, that added together give a palindrome (648846).

The spelling of 6648840 in words is "six million, six hundred forty-eight thousand, eight hundred forty".