7645221 has 12 divisors (see below), whose sum is σ = 11083072. Its totient is φ = 5078376.

The previous prime is 7645219. The next prime is 7645237. The reversal of 7645221 is 1225467.

It is not a de Polignac number, because 7645221 - 2¹ = 7645219 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1380 + ... + 4146.

Almost surely, 2^7645221 is an apocalyptic number.

It is an amenable number.

7645221 is a deficient number, since it is larger than the sum of its proper divisors (3437851).

7645221 is a wasteful number, since it uses less digits than its factorization.

7645221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080 (or 3077 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 7645221 is about 2764.9992766726. Note that the first 3 decimals coincide. The cubic root of 7645221 is about 196.9986944523.

The spelling of 7645221 in words is "seven million, six hundred forty-five thousand, two hundred twenty-one".