6440575 has 18 divisors (see below), whose sum is σ = 8365784. Its totient is φ = 4918320.

The previous prime is 6440561. The next prime is 6440579. The reversal of 6440575 is 5750446.

It is a happy number.

It is not a de Polignac number, because 6440575 - 2⁵ = 6440543 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440579) 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 17 ways as a sum of consecutive naturals, for example, 12982 + ... + 13468.

Almost surely, 2^6440575 is an apocalyptic number.

6440575 is a deficient number, since it is larger than the sum of its proper divisors (1925209).

6440575 is a wasteful number, since it uses less digits than its factorization.

6440575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 6440575 is about 2537.8287964321. The cubic root of 6440575 is about 186.0550863932.

The spelling of 6440575 in words is "six million, four hundred forty thousand, five hundred seventy-five".