6645875 has 16 divisors (see below), whose sum is σ = 8411520. Its totient is φ = 5241600.

The previous prime is 6645871. The next prime is 6645883. The reversal of 6645875 is 5785466.

It is not a de Polignac number, because 6645875 - 2² = 6645871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6645871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9539 + ... + 10211.

It is an arithmetic number, because the mean of its divisors is an integer number (525720).

Almost surely, 2^6645875 is an apocalyptic number.

6645875 is a deficient number, since it is larger than the sum of its proper divisors (1765645).

6645875 is an equidigital number, since it uses as much as digits as its factorization.

6645875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767 (or 757 counting only the distinct ones).

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

The square root of 6645875 is about 2577.9594643826. The cubic root of 6645875 is about 188.0113449469.

The spelling of 6645875 in words is "six million, six hundred forty-five thousand, eight hundred seventy-five".