646675 has 6 divisors (see below), whose sum is σ = 801908. Its totient is φ = 517320.

The previous prime is 646669. The next prime is 646687. The reversal of 646675 is 576646.

It is not a de Polignac number, because 646675 - 2⁵ = 646643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646675.

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 5 ways as a sum of consecutive naturals, for example, 12909 + ... + 12958.

2⁶⁴⁶⁶⁷⁵ is an apocalyptic number.

646675 is a deficient number, since it is larger than the sum of its proper divisors (155233).

646675 is a wasteful number, since it uses less digits than its factorization.

646675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25877 (or 25872 counting only the distinct ones).

The product of its digits is 30240, while the sum is 34.

The square root of 646675 is about 804.1610535210. The cubic root of 646675 is about 86.4759530871.

The spelling of 646675 in words is "six hundred forty-six thousand, six hundred seventy-five".