6540556 has 36 divisors (see below), whose sum is σ = 13099464. Its totient is φ = 2833600.

The previous prime is 6540539. The next prime is 6540557. The reversal of 6540556 is 6550456.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6540557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23136 + ... + 23416.

It is an arithmetic number, because the mean of its divisors is an integer number (363874).

Almost surely, 2^6540556 is an apocalyptic number.

It is an amenable number.

6540556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

6540556 is a wasteful number, since it uses less digits than its factorization.

6540556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 6540556 is about 2557.4510748008. The cubic root of 6540556 is about 187.0128962481.

Adding to 6540556 its product of nonzero digits (18000), we get a palindrome (6558556).

The spelling of 6540556 in words is "six million, five hundred forty thousand, five hundred fifty-six".