6556540 has 12 divisors (see below), whose sum is σ = 13768776. Its totient is φ = 2622608.

The previous prime is 6556519. The next prime is 6556559. The reversal of 6556540 is 456556.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 163894 + ... + 163933.

It is an arithmetic number, because the mean of its divisors is an integer number (1147398).

Almost surely, 2^6556540 is an apocalyptic number.

It is an amenable number.

6556540 is an abundant number, since it is smaller than the sum of its proper divisors (7212236).

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

6556540 is a wasteful number, since it uses less digits than its factorization.

6556540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327836 (or 327834 counting only the distinct ones).

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

The square root of 6556540 is about 2560.5741543646. The cubic root of 6556540 is about 187.1651148256.

The spelling of 6556540 in words is "six million, five hundred fifty-six thousand, five hundred forty".