199290768 has 80 divisors (see below), whose sum is σ = 543048576. Its totient is φ = 62853120.

The previous prime is 199290733. The next prime is 199290781. The reversal of 199290768 is 867092991.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 199290768.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106158 + ... + 108018.

Almost surely, 2^199290768 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 199290768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271524288).

199290768 is an abundant number, since it is smaller than the sum of its proper divisors (343757808).

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

199290768 is a wasteful number, since it uses less digits than its factorization.

199290768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992 (or 1986 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 51.

The square root of 199290768 is about 14117.0382162832. The cubic root of 199290768 is about 584.1114599293. Note that the first 3 decimals are identical.

The spelling of 199290768 in words is "one hundred ninety-nine million, two hundred ninety thousand, seven hundred sixty-eight".