6544668 has 24 divisors (see below), whose sum is σ = 16445968. Its totient is φ = 2013696.

The previous prime is 6544667. The next prime is 6544739. The reversal of 6544668 is 8664456.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6544663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20821 + ... + 21132.

Almost surely, 2^6544668 is an apocalyptic number.

It is an amenable number.

6544668 is an abundant number, since it is smaller than the sum of its proper divisors (9901300).

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

6544668 is a wasteful number, since it uses less digits than its factorization.

6544668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41973 (or 41971 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 6544668 is about 2558.2548739326. The cubic root of 6544668 is about 187.0520792539.

The spelling of 6544668 in words is "six million, five hundred forty-four thousand, six hundred sixty-eight".