6720444 has 18 divisors (see below), whose sum is σ = 16987880. Its totient is φ = 2240136.

The previous prime is 6720443. The next prime is 6720473. The reversal of 6720444 is 4440276.

It is a tau number, because it is divible by the number of its divisors (18).

It is an Ulam number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720443) 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 5 ways as a sum of consecutive naturals, for example, 93304 + ... + 93375.

Almost surely, 2^6720444 is an apocalyptic number.

It is an amenable number.

6720444 is an abundant number, since it is smaller than the sum of its proper divisors (10267436).

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

6720444 is a wasteful number, since it uses less digits than its factorization.

6720444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186689 (or 186684 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 6720444 is about 2592.3819163079. The cubic root of 6720444 is about 188.7119151849.

The spelling of 6720444 in words is "six million, seven hundred twenty thousand, four hundred forty-four".