198128886 has 16 divisors (see below), whose sum is σ = 396480000. Its totient is φ = 66005928.

The previous prime is 198128867. The next prime is 198128921. The reversal of 198128886 is 688821891.

It is a happy number.

It is a super-3 number, since 3×198128886³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3735 + ... + 20253.

It is an arithmetic number, because the mean of its divisors is an integer number (24780000).

Almost surely, 2^198128886 is an apocalyptic number.

198128886 is an abundant number, since it is smaller than the sum of its proper divisors (198351114).

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

198128886 is a wasteful number, since it uses less digits than its factorization.

198128886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18523.

The product of its digits is 442368, while the sum is 51.

The square root of 198128886 is about 14075.8262990135. The cubic root of 198128886 is about 582.9741070638.

The spelling of 198128886 in words is "one hundred ninety-eight million, one hundred twenty-eight thousand, eight hundred eighty-six".