6440168 has 32 divisors (see below), whose sum is σ = 14088000. Its totient is φ = 2758896.

The previous prime is 6440149. The next prime is 6440171. The reversal of 6440168 is 8610446.

It is a self number, because there is not a number n which added to its sum of digits gives 6440168.

It is a congruent number.

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, 1571 + ... + 3917.

It is an arithmetic number, because the mean of its divisors is an integer number (440250).

Almost surely, 2^6440168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6440168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7044000).

6440168 is an abundant number, since it is smaller than the sum of its proper divisors (7647832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440168 is a wasteful number, since it uses less digits than its factorization.

6440168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374 (or 2356 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 6440168 is about 2537.7486085111. The cubic root of 6440168 is about 186.0511671771.

It can be divided in two parts, 64 and 40168, that multiplied together give a palindrome (2570752).

The spelling of 6440168 in words is "six million, four hundred forty thousand, one hundred sixty-eight".