6364440 has 128 divisors (see below), whose sum is σ = 21772800. Its totient is φ = 1653120.

The previous prime is 6364433. The next prime is 6364441. The reversal of 6364440 is 444636.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6364441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76639 + ... + 76721.

It is an arithmetic number, because the mean of its divisors is an integer number (170100).

Almost surely, 2^6364440 is an apocalyptic number.

6364440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6364440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10886400).

6364440 is an abundant number, since it is smaller than the sum of its proper divisors (15408360).

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

6364440 is a wasteful number, since it uses less digits than its factorization.

6364440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 6364440 is about 2522.7841762624. The cubic root of 6364440 is about 185.3190501331.

The spelling of 6364440 in words is "six million, three hundred sixty-four thousand, four hundred forty".