198000640 has 60 divisors (see below), whose sum is σ = 475383636. Its totient is φ = 79167488.

The previous prime is 198000619. The next prime is 198000697. The reversal of 198000640 is 46000891.

It can be written as a sum of positive squares in 2 ways, for example, as 144769024 + 53231616 = 12032^2 + 7296^2 .

It is a junction number, because it is equal to n+sod(n) for n = 198000599 and 198000608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80712 + ... + 83128.

Almost surely, 2^198000640 is an apocalyptic number.

198000640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198000640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237691818).

198000640 is an abundant number, since it is smaller than the sum of its proper divisors (277382996).

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

198000640 is an frugal number, since it uses more digits than its factorization.

198000640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450 (or 2424 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 198000640 is about 14071.2700208617. The cubic root of 198000640 is about 582.8482963085.

The spelling of 198000640 in words is "one hundred ninety-eight million, six hundred forty", and thus it is an aban number.