664431198 has 16 divisors (see below), whose sum is σ = 1357136640. Its totient is φ = 216764696.

The previous prime is 664431169. The next prime is 664431203. The reversal of 664431198 is 891134466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1177788 + ... + 1178351.

It is an arithmetic number, because the mean of its divisors is an integer number (84821040).

Almost surely, 2^664431198 is an apocalyptic number.

664431198 is an abundant number, since it is smaller than the sum of its proper divisors (692705442).

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

664431198 is a wasteful number, since it uses less digits than its factorization.

664431198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356191.

The product of its digits is 124416, while the sum is 42.

The square root of 664431198 is about 25776.5629594017. The cubic root of 664431198 is about 872.6029404299.

The spelling of 664431198 in words is "six hundred sixty-four million, four hundred thirty-one thousand, one hundred ninety-eight".