6388668 has 144 divisors (see below), whose sum is σ = 20363616. Its totient is φ = 1658880.

The previous prime is 6388667. The next prime is 6388691. The reversal of 6388668 is 8668836.

6388668 is a `hidden beast` number, since 638 + 8 + 6 + 6 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6388667) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87480 + ... + 87552.

It is an arithmetic number, because the mean of its divisors is an integer number (141414).

Almost surely, 2^6388668 is an apocalyptic number.

6388668 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6388668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10181808).

6388668 is an abundant number, since it is smaller than the sum of its proper divisors (13974948).

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

6388668 is a wasteful number, since it uses less digits than its factorization.

6388668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 119 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 6388668 is about 2527.5814526935. The cubic root of 6388668 is about 185.5539084293.

It can be divided in two parts, 6388 and 668, that added together give a square (7056 = 84²).

The spelling of 6388668 in words is "six million, three hundred eighty-eight thousand, six hundred sixty-eight".