6445625 has 10 divisors (see below), whose sum is σ = 8055234. Its totient is φ = 5156000.

The previous prime is 6445619. The next prime is 6445639. The reversal of 6445625 is 5265446.

It can be written as a sum of positive squares in 5 ways, for example, as 2808976 + 3636649 = 1676^2 + 1907^2 .

It is not a de Polignac number, because 6445625 - 2¹⁰ = 6444601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6445591 and 6445600.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4532 + ... + 5781.

Almost surely, 2^6445625 is an apocalyptic number.

It is an amenable number.

6445625 is a deficient number, since it is larger than the sum of its proper divisors (1609609).

6445625 is an equidigital number, since it uses as much as digits as its factorization.

6445625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10333 (or 10318 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

The square root of 6445625 is about 2538.8235464482. The cubic root of 6445625 is about 186.1037017586.

The spelling of 6445625 in words is "six million, four hundred forty-five thousand, six hundred twenty-five".