6440368 has 80 divisors (see below), whose sum is σ = 14927616. Its totient is φ = 2661120.

The previous prime is 6440359. The next prime is 6440383. The reversal of 6440368 is 8630446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149755 + ... + 149797.

Almost surely, 2^6440368 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 6440368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7463808).

6440368 is an abundant number, since it is smaller than the sum of its proper divisors (8487248).

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

6440368 is a wasteful number, since it uses less digits than its factorization.

6440368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 6440368 is about 2537.7880132115. The cubic root of 6440368 is about 186.0530931024.

The spelling of 6440368 in words is "six million, four hundred forty thousand, three hundred sixty-eight".