198289728 has 336 divisors, whose sum is σ = 728837760. Its totient is φ = 51757056.

The previous prime is 198289709. The next prime is 198289781. The reversal of 198289728 is 827982891.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2044176 + ... + 2044272.

It is an arithmetic number, because the mean of its divisors is an integer number (2169160).

Almost surely, 2^198289728 is an apocalyptic number.

198289728 is a gapful number since it is divisible by the number (18) 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 198289728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364418880).

198289728 is an abundant number, since it is smaller than the sum of its proper divisors (530548032).

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

198289728 is a wasteful number, since it uses less digits than its factorization.

198289728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 122 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 198289728 is about 14081.5385523032. The cubic root of 198289728 is about 583.1318181397.

The spelling of 198289728 in words is "one hundred ninety-eight million, two hundred eighty-nine thousand, seven hundred twenty-eight".