6647225 has 24 divisors (see below), whose sum is σ = 9004632. Its totient is φ = 4838400.

The previous prime is 6647219. The next prime is 6647227. The reversal of 6647225 is 5227466.

It can be written as a sum of positive squares in 12 ways, for example, as 6446521 + 200704 = 2539^2 + 448^2 .

It is not a de Polignac number, because 6647225 - 2⁴ = 6647209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6647191 and 6647200.

It is not an unprimeable number, because it can be changed into a prime (6647227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36635 + ... + 36815.

It is an arithmetic number, because the mean of its divisors is an integer number (375193).

Almost surely, 2^6647225 is an apocalyptic number.

6647225 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6647225 is a deficient number, since it is larger than the sum of its proper divisors (2357407).

6647225 is a wasteful number, since it uses less digits than its factorization.

6647225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 312 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 6647225 is about 2578.2212860808. The cubic root of 6647225 is about 188.0240745539.

The spelling of 6647225 in words is "six million, six hundred forty-seven thousand, two hundred twenty-five".