6620225 has 24 divisors (see below), whose sum is σ = 8948088. Its totient is φ = 4838400.

The previous prime is 6620209. The next prime is 6620231. The reversal of 6620225 is 5220266.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 1620529 + 4999696 = 1273^2 + 2236^2 .

It is not a de Polignac number, because 6620225 - 2⁴ = 6620209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6620225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15515 + ... + 15935.

It is an arithmetic number, because the mean of its divisors is an integer number (372837).

Almost surely, 2^6620225 is an apocalyptic number.

It is an amenable number.

6620225 is a deficient number, since it is larger than the sum of its proper divisors (2327863).

6620225 is a wasteful number, since it uses less digits than its factorization.

6620225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 6620225 is about 2572.9797900489. The cubic root of 6620225 is about 187.7691541880.

The spelling of 6620225 in words is "six million, six hundred twenty thousand, two hundred twenty-five".