6638544 has 120 divisors (see below), whose sum is σ = 21109760. Its totient is φ = 1995840.

The previous prime is 6638531. The next prime is 6638549. The reversal of 6638544 is 4458366.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6638499 and 6638508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638549) 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 23 ways as a sum of consecutive naturals, for example, 52209 + ... + 52335.

Almost surely, 2^6638544 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 6638544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10554880).

6638544 is an abundant number, since it is smaller than the sum of its proper divisors (14471216).

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

6638544 is a wasteful number, since it uses less digits than its factorization.

6638544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 143 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 6638544 is about 2576.5372110645. The cubic root of 6638544 is about 187.9421883507.

The spelling of 6638544 in words is "six million, six hundred thirty-eight thousand, five hundred forty-four".