6646638 has 8 divisors (see below), whose sum is σ = 13293288. Its totient is φ = 2215544.

The previous prime is 6646613. The next prime is 6646657. The reversal of 6646638 is 8366466.

It is a sphenic number, since it is the product of 3 distinct primes.

6646638 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 6646596 and 6646605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553881 + ... + 553892.

It is an arithmetic number, because the mean of its divisors is an integer number (1661661).

Almost surely, 2^6646638 is an apocalyptic number.

6646638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6646638 is a wasteful number, since it uses less digits than its factorization.

6646638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107778.

The product of its digits is 124416, while the sum is 39.

The square root of 6646638 is about 2578.1074453948. The cubic root of 6646638 is about 188.0185397440.

The spelling of 6646638 in words is "six million, six hundred forty-six thousand, six hundred thirty-eight".