198965688 has 64 divisors (see below), whose sum is σ = 543697920. Its totient is φ = 60403200.

The previous prime is 198965659. The next prime is 198965699. The reversal of 198965688 is 886569891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4783 + ... + 20513.

It is an arithmetic number, because the mean of its divisors is an integer number (8495280).

Almost surely, 2^198965688 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 198965688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271848960).

198965688 is an abundant number, since it is smaller than the sum of its proper divisors (344732232).

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

198965688 is a wasteful number, since it uses less digits than its factorization.

198965688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15788 (or 15784 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 60.

The square root of 198965688 is about 14105.5197706430. The cubic root of 198965688 is about 583.7936892440.

The spelling of 198965688 in words is "one hundred ninety-eight million, nine hundred sixty-five thousand, six hundred eighty-eight".