6820225 has 6 divisors (see below), whose sum is σ = 8457110. Its totient is φ = 5456160.

The previous prime is 6820211. The next prime is 6820241. The reversal of 6820225 is 5220286.

It can be written as a sum of positive squares in 3 ways, for example, as 101761 + 6718464 = 319^2 + 2592^2 .

It is not a de Polignac number, because 6820225 - 2⁷ = 6820097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 272809 = 6820225 / (6 + 8 + 2 + 0 + 2 + 2 + 5).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6820225.

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 5 ways as a sum of consecutive naturals, for example, 136380 + ... + 136429.

Almost surely, 2^6820225 is an apocalyptic number.

It is an amenable number.

6820225 is a deficient number, since it is larger than the sum of its proper divisors (1636885).

6820225 is a wasteful number, since it uses less digits than its factorization.

6820225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272819 (or 272814 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 6820225 is about 2611.5560495613. The cubic root of 6820225 is about 189.6412899594.

The spelling of 6820225 in words is "six million, eight hundred twenty thousand, two hundred twenty-five".