6397668 has 36 divisors (see below), whose sum is σ = 16406208. Its totient is φ = 2101680.

The previous prime is 6397667. The next prime is 6397691. The reversal of 6397668 is 8667936.

6397668 is a `hidden beast` number, since 639 + 7 + 6 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6397667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1305 + ... + 3807.

It is an arithmetic number, because the mean of its divisors is an integer number (455728).

Almost surely, 2^6397668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6397668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8203104).

6397668 is an abundant number, since it is smaller than the sum of its proper divisors (10008540).

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

6397668 is a wasteful number, since it uses less digits than its factorization.

6397668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584 (or 2579 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 6397668 is about 2529.3611841728. The cubic root of 6397668 is about 185.6410002193.

The spelling of 6397668 in words is "six million, three hundred ninety-seven thousand, six hundred sixty-eight".