6445685 has 8 divisors (see below), whose sum is σ = 8001720. Its totient is φ = 4978624.

The previous prime is 6445661. The next prime is 6445711. The reversal of 6445685 is 5865446.

It can be written as a sum of positive squares in 4 ways, for example, as 165649 + 6280036 = 407^2 + 2506^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6445685 - 2¹⁶ = 6380149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22082 + ... + 22371.

It is an arithmetic number, because the mean of its divisors is an integer number (1000215).

Almost surely, 2^6445685 is an apocalyptic number.

It is an amenable number.

6445685 is a deficient number, since it is larger than the sum of its proper divisors (1556035).

6445685 is a wasteful number, since it uses less digits than its factorization.

6445685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44487.

The product of its digits is 115200, while the sum is 38.

The square root of 6445685 is about 2538.8353629174. The cubic root of 6445685 is about 186.1042792142.

The spelling of 6445685 in words is "six million, four hundred forty-five thousand, six hundred eighty-five".