6544040 has 16 divisors (see below), whose sum is σ = 14724180. Its totient is φ = 2617600.

The previous prime is 6544039. The next prime is 6544049. The reversal of 6544040 is 404456.

Added to its reverse (404456) it gives a square (6948496 = 2636²).

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6543364 + 676 = 2558^2 + 26^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6543997 and 6544015.

It is not an unprimeable number, because it can be changed into a prime (6544049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81761 + ... + 81840.

Almost surely, 2^6544040 is an apocalyptic number.

It is an amenable number.

6544040 is an abundant number, since it is smaller than the sum of its proper divisors (8180140).

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

6544040 is a wasteful number, since it uses less digits than its factorization.

6544040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163612 (or 163608 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 6544040 is about 2558.1321310675. The cubic root of 6544040 is about 187.0460961410.

Adding to 6544040 its reverse (404456), we get a palindrome (6948496).

The spelling of 6544040 in words is "six million, five hundred forty-four thousand, forty".