6440164 has 24 divisors (see below), whose sum is σ = 11995200. Its totient is φ = 3016800.

The previous prime is 6440149. The next prime is 6440171. The reversal of 6440164 is 4610446.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7257 + ... + 8095.

It is an arithmetic number, because the mean of its divisors is an integer number (499800).

Almost surely, 2^6440164 is an apocalyptic number.

It is an amenable number.

6440164 is a deficient number, since it is larger than the sum of its proper divisors (5555036).

6440164 is a wasteful number, since it uses less digits than its factorization.

6440164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963 (or 961 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 6440164 is about 2537.7478204108. The cubic root of 6440164 is about 186.0511286582.

The spelling of 6440164 in words is "six million, four hundred forty thousand, one hundred sixty-four".