6638320 has 60 divisors (see below), whose sum is σ = 16746696. Its totient is φ = 2446080.

The previous prime is 6638299. The next prime is 6638321. The reversal of 6638320 is 238366.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13275 + ... + 13765.

Almost surely, 2^6638320 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 6638320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8373348).

6638320 is an abundant number, since it is smaller than the sum of its proper divisors (10108376).

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

6638320 is a wasteful number, since it uses less digits than its factorization.

6638320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 6638320 is about 2576.4937415022. The cubic root of 6638320 is about 187.9400744573.

The spelling of 6638320 in words is "six million, six hundred thirty-eight thousand, three hundred twenty".