6344640 has 84 divisors (see below), whose sum is σ = 21832824. Its totient is φ = 1691136.

The previous prime is 6344623. The next prime is 6344641. The reversal of 6344640 is 464436.

It is a happy number.

It is an Ulam number.

It is a zygodrome in base 2 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6344641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1779 + ... + 3981.

Almost surely, 2^6344640 is an apocalyptic number.

6344640 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 6344640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10916412).

6344640 is an abundant number, since it is smaller than the sum of its proper divisors (15488184).

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

6344640 is a wasteful number, since it uses less digits than its factorization.

6344640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226 (or 2213 counting only the distinct ones).

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

The square root of 6344640 is about 2518.8568835883. The cubic root of 6344640 is about 185.1266724372.

The spelling of 6344640 in words is "six million, three hundred forty-four thousand, six hundred forty".