6638490 has 64 divisors (see below), whose sum is σ = 18489600. Its totient is φ = 1691712.

The previous prime is 6638473. The next prime is 6638491. The reversal of 6638490 is 948366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638491) 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, 5676 + ... + 6744.

It is an arithmetic number, because the mean of its divisors is an integer number (288900).

Almost surely, 2^6638490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6638490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9244800).

6638490 is an abundant number, since it is smaller than the sum of its proper divisors (11851110).

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

6638490 is a wasteful number, since it uses less digits than its factorization.

6638490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108 (or 1102 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6638490 is about 2576.5267318621. The cubic root of 6638490 is about 187.9416787557.

The spelling of 6638490 in words is "six million, six hundred thirty-eight thousand, four hundred ninety".