198542728 has 16 divisors (see below), whose sum is σ = 394165980. Its totient is φ = 93431808.

The previous prime is 198542657. The next prime is 198542749. The reversal of 198542728 is 827245891.

It can be written as a sum of positive squares in 2 ways, for example, as 192598884 + 5943844 = 13878^2 + 2438^2 .

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 3 ways as a sum of consecutive naturals, for example, 729801 + ... + 730072.

Almost surely, 2^198542728 is an apocalyptic number.

It is an amenable number.

198542728 is a deficient number, since it is larger than the sum of its proper divisors (195623252).

198542728 is a wasteful number, since it uses less digits than its factorization.

198542728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459896 (or 1459892 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 198542728 is about 14090.5190819927. The cubic root of 198542728 is about 583.3797207918.

The spelling of 198542728 in words is "one hundred ninety-eight million, five hundred forty-two thousand, seven hundred twenty-eight".