7644221 has 8 divisors (see below), whose sum is σ = 8408064. Its totient is φ = 6905520.

The previous prime is 7644199. The next prime is 7644223. The reversal of 7644221 is 1224467.

7644221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7644221 - 2⁶ = 7644157 is a prime.

It is a super-2 number, since 2×7644221² = 116868229393682, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7644223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5645 + ... + 6866.

It is an arithmetic number, because the mean of its divisors is an integer number (1051008).

Almost surely, 2^7644221 is an apocalyptic number.

It is an amenable number.

7644221 is a deficient number, since it is larger than the sum of its proper divisors (763843).

7644221 is a wasteful number, since it uses less digits than its factorization.

7644221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12571.

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

The square root of 7644221 is about 2764.8184388853. The cubic root of 7644221 is about 196.9901048909.

Adding to 7644221 its reverse (1224467), we get a palindrome (8868688).

The spelling of 7644221 in words is "seven million, six hundred forty-four thousand, two hundred twenty-one".