6398664 has 32 divisors (see below), whose sum is σ = 16938720. Its totient is φ = 2007296.

The previous prime is 6398633. The next prime is 6398671. The reversal of 6398664 is 4668936.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7434 + ... + 8249.

It is an arithmetic number, because the mean of its divisors is an integer number (529335).

Almost surely, 2^6398664 is an apocalyptic number.

It is an amenable number.

6398664 is an abundant number, since it is smaller than the sum of its proper divisors (10540056).

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

6398664 is a wasteful number, since it uses less digits than its factorization.

6398664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15709 (or 15705 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 6398664 is about 2529.5580641685. The cubic root of 6398664 is about 185.6506333565.

The spelling of 6398664 in words is "six million, three hundred ninety-eight thousand, six hundred sixty-four".