6928221 has 32 divisors (see below), whose sum is σ = 10321920. Its totient is φ = 4118400.

The previous prime is 6928219. The next prime is 6928237. The reversal of 6928221 is 1228296.

6928221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6928221 - 2¹ = 6928219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6928241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87660 + ... + 87738.

It is an arithmetic number, because the mean of its divisors is an integer number (322560).

Almost surely, 2^6928221 is an apocalyptic number.

It is an amenable number.

6928221 is a deficient number, since it is larger than the sum of its proper divisors (3393699).

6928221 is a wasteful number, since it uses less digits than its factorization.

6928221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177.

The product of its digits is 3456, while the sum is 30.

The square root of 6928221 is about 2632.1514014205. The cubic root of 6928221 is about 190.6370215835.

The spelling of 6928221 in words is "six million, nine hundred twenty-eight thousand, two hundred twenty-one".