6481638 has 12 divisors (see below), whose sum is σ = 14043588. Its totient is φ = 2160540.

The previous prime is 6481627. The next prime is 6481639. The reversal of 6481638 is 8361846.

It is a happy number.

6481638 is a `hidden beast` number, since 648 + 1 + 6 + 3 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6481639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 180028 + ... + 180063.

It is an arithmetic number, because the mean of its divisors is an integer number (1170299).

Almost surely, 2^6481638 is an apocalyptic number.

6481638 is an abundant number, since it is smaller than the sum of its proper divisors (7561950).

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

6481638 is a wasteful number, since it uses less digits than its factorization.

6481638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360099 (or 360096 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 6481638 is about 2545.9061255278. The cubic root of 6481638 is about 186.4496578204.

The spelling of 6481638 in words is "six million, four hundred eighty-one thousand, six hundred thirty-eight".