6490638 has 96 divisors (see below), whose sum is σ = 18385920. Its totient is φ = 1678320.

The previous prime is 6490613. The next prime is 6490643. The reversal of 6490638 is 8360946.

6490638 is a `hidden beast` number, since 649 + 0 + 6 + 3 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28995 + ... + 29217.

It is an arithmetic number, because the mean of its divisors is an integer number (191520).

Almost surely, 2^6490638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6490638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9192960).

6490638 is an abundant number, since it is smaller than the sum of its proper divisors (11895282).

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

6490638 is a wasteful number, since it uses less digits than its factorization.

6490638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 246 counting only the distinct ones).

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

The square root of 6490638 is about 2547.6730559473. The cubic root of 6490638 is about 186.5359153807.

The spelling of 6490638 in words is "six million, four hundred ninety thousand, six hundred thirty-eight".