6668638 has 8 divisors (see below), whose sum is σ = 10025280. Its totient is φ = 3326880.

The previous prime is 6668617. The next prime is 6668659. The reversal of 6668638 is 8368666.

It is an interprime number because it is at equal distance from previous prime (6668617) and next prime (6668659).

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

It is a junction number, because it is equal to n+sod(n) for n = 6668594 and 6668603.

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, 2523 + ... + 4438.

It is an arithmetic number, because the mean of its divisors is an integer number (1253160).

Almost surely, 2^6668638 is an apocalyptic number.

6668638 is a deficient number, since it is larger than the sum of its proper divisors (3356642).

6668638 is a wasteful number, since it uses less digits than its factorization.

6668638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7442.

The product of its digits is 248832, while the sum is 43.

The square root of 6668638 is about 2582.3706163136. The cubic root of 6668638 is about 188.2257549049.

The spelling of 6668638 in words is "six million, six hundred sixty-eight thousand, six hundred thirty-eight".