198031728 has 40 divisors (see below), whose sum is σ = 515034000. Its totient is φ = 65565184.

The previous prime is 198031723. The next prime is 198031739. The reversal of 198031728 is 827130891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198031723) 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, 6693 + ... + 20996.

It is an arithmetic number, because the mean of its divisors is an integer number (12875850).

Almost surely, 2^198031728 is an apocalyptic number.

It is an amenable number.

198031728 is an abundant number, since it is smaller than the sum of its proper divisors (317002272).

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

198031728 is a wasteful number, since it uses less digits than its factorization.

198031728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27849 (or 27843 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 198031728 is about 14072.3746396975. The cubic root of 198031728 is about 582.8787989702.

The spelling of 198031728 in words is "one hundred ninety-eight million, thirty-one thousand, seven hundred twenty-eight".