6664398 has 32 divisors (see below), whose sum is σ = 14695296. Its totient is φ = 2001888.

The previous prime is 6664387. The next prime is 6664417. The reversal of 6664398 is 8934666.

6664398 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2361 + ... + 4347.

It is an arithmetic number, because the mean of its divisors is an integer number (459228).

Almost surely, 2^6664398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6664398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7347648).

6664398 is an abundant number, since it is smaller than the sum of its proper divisors (8030898).

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

6664398 is a wasteful number, since it uses less digits than its factorization.

6664398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048.

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

The square root of 6664398 is about 2581.5495346787. The cubic root of 6664398 is about 188.1858543834.

The spelling of 6664398 in words is "six million, six hundred sixty-four thousand, three hundred ninety-eight".