6721244 has 24 divisors (see below), whose sum is σ = 12566400. Its totient is φ = 3137904.

The previous prime is 6721237. The next prime is 6721259. The reversal of 6721244 is 4421276.

It is a congruent number.

It is an unprimeable number.

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, 3107 + ... + 4805.

It is an arithmetic number, because the mean of its divisors is an integer number (523600).

Almost surely, 2^6721244 is an apocalyptic number.

It is an amenable number.

6721244 is a deficient number, since it is larger than the sum of its proper divisors (5845156).

6721244 is a wasteful number, since it uses less digits than its factorization.

6721244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769 (or 1767 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 6721244 is about 2592.5362099689. The cubic root of 6721244 is about 188.7194029611.

Subtracting from 6721244 its reverse (4421276), we obtain a cube (2299968 = 132³).

The spelling of 6721244 in words is "six million, seven hundred twenty-one thousand, two hundred forty-four".