198178728 has 64 divisors (see below), whose sum is σ = 541840320. Its totient is φ = 59904000.

The previous prime is 198178709. The next prime is 198178751. The reversal of 198178728 is 827871891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151678 + ... + 152978.

It is an arithmetic number, because the mean of its divisors is an integer number (8466255).

Almost surely, 2^198178728 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 198178728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270920160).

198178728 is an abundant number, since it is smaller than the sum of its proper divisors (343661592).

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

198178728 is a wasteful number, since it uses less digits than its factorization.

198178728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898 (or 1894 counting only the distinct ones).

The product of its digits is 451584, while the sum is 51.

The square root of 198178728 is about 14077.5966698865. The cubic root of 198178728 is about 583.0229879713.

The spelling of 198178728 in words is "one hundred ninety-eight million, one hundred seventy-eight thousand, seven hundred twenty-eight".