198057728 has 72 divisors (see below), whose sum is σ = 438732336. Its totient is φ = 88473600.

The previous prime is 198057709. The next prime is 198057731. The reversal of 198057728 is 827750891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171200 + ... + 172352.

Almost surely, 2^198057728 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 198057728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219366168).

198057728 is an abundant number, since it is smaller than the sum of its proper divisors (240674608).

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

198057728 is a wasteful number, since it uses less digits than its factorization.

198057728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241 (or 1227 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 47.

The square root of 198057728 is about 14073.2984051359. The cubic root of 198057728 is about 582.9043069796.

The spelling of 198057728 in words is "one hundred ninety-eight million, fifty-seven thousand, seven hundred twenty-eight".