646375 has 8 divisors (see below), whose sum is σ = 806832. Its totient is φ = 517000.

The previous prime is 646339. The next prime is 646379. The reversal of 646375 is 573646.

It is not a de Polignac number, because 646375 - 2¹¹ = 644327 is a prime.

It is a d-powerful number, because it can be written as 6³ + 4⁸ + 3¹² + 6⁶ + 7⁴ + 5³ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2461 + ... + 2710.

It is an arithmetic number, because the mean of its divisors is an integer number (100854).

2⁶⁴⁶³⁷⁵ is an apocalyptic number.

646375 is a deficient number, since it is larger than the sum of its proper divisors (160457).

646375 is an equidigital number, since it uses as much as digits as its factorization.

646375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5186 (or 5176 counting only the distinct ones).

The product of its digits is 15120, while the sum is 31.

The square root of 646375 is about 803.9745020832. The cubic root of 646375 is about 86.4625786209.

The spelling of 646375 in words is "six hundred forty-six thousand, three hundred seventy-five".