6647040 has 108 divisors (see below), whose sum is σ = 23037924. Its totient is φ = 1769472.

The previous prime is 6647033. The next prime is 6647041. The reversal of 6647040 is 407466.

It can be written as a sum of positive squares in 2 ways, for example, as 5089536 + 1557504 = 2256^2 + 1248^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6646995 and 6647013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647041) 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, 11232 + ... + 11808.

Almost surely, 2^6647040 is an apocalyptic number.

6647040 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 6647040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11518962).

6647040 is an abundant number, since it is smaller than the sum of its proper divisors (16390884).

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

6647040 is a wasteful number, since it uses less digits than its factorization.

6647040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604 (or 587 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 6647040 is about 2578.1854083832. The cubic root of 6647040 is about 188.0223302282.

The spelling of 6647040 in words is "six million, six hundred forty-seven thousand, forty".