6645785 has 8 divisors (see below), whose sum is σ = 8250120. Its totient is φ = 5133184.

The previous prime is 6645757. The next prime is 6645787. The reversal of 6645785 is 5875466.

It can be written as a sum of positive squares in 4 ways, for example, as 1024144 + 5621641 = 1012^2 + 2371^2 .

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 6645785 - 2⁶ = 6645721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6645787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22772 + ... + 23061.

It is an arithmetic number, because the mean of its divisors is an integer number (1031265).

Almost surely, 2^6645785 is an apocalyptic number.

It is an amenable number.

6645785 is a deficient number, since it is larger than the sum of its proper divisors (1604335).

6645785 is a wasteful number, since it uses less digits than its factorization.

6645785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45867.

The product of its digits is 201600, while the sum is 41.

The square root of 6645785 is about 2577.9420086573. The cubic root of 6645785 is about 188.0104962451.

The spelling of 6645785 in words is "six million, six hundred forty-five thousand, seven hundred eighty-five".