198923502890 has 32 divisors (see below), whose sum is σ = 422414521344. Its totient is φ = 66002267520.

The previous prime is 198923502871. The next prime is 198923502923. The reversal of 198923502890 is 98205329891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45832739 + ... + 45837078.

It is an arithmetic number, because the mean of its divisors is an integer number (13200453792).

Almost surely, 2^198923502890 is an apocalyptic number.

198923502890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198923502890 is an abundant number, since it is smaller than the sum of its proper divisors (223491018454).

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

198923502890 is a wasteful number, since it uses less digits than its factorization.

198923502890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91669862.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The spelling of 198923502890 in words is "one hundred ninety-eight billion, nine hundred twenty-three million, five hundred two thousand, eight hundred ninety".