198638647232 has 56 divisors (see below), whose sum is σ = 405015356592. Its totient is φ = 96606720000.

The previous prime is 198638647231. The next prime is 198638647237. The reversal of 198638647232 is 232746836891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198638647231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513482 + ... + 812982.

It is an arithmetic number, because the mean of its divisors is an integer number (7232417082).

Almost surely, 2^198638647232 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 198638647232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202507678296).

198638647232 is an abundant number, since it is smaller than the sum of its proper divisors (206376709360).

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

198638647232 is a wasteful number, since it uses less digits than its factorization.

198638647232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299797 (or 299787 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 59.

The spelling of 198638647232 in words is "one hundred ninety-eight billion, six hundred thirty-eight million, six hundred forty-seven thousand, two hundred thirty-two".