199997768 has 16 divisors (see below), whose sum is σ = 375511680. Its totient is φ = 99861328.

The previous prime is 199997767. The next prime is 199997797. The reversal of 199997768 is 867799991.

It is not an unprimeable number, because it can be changed into a prime (199997761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10880 + ... + 22767.

It is an arithmetic number, because the mean of its divisors is an integer number (23469480).

Almost surely, 2^199997768 is an apocalyptic number.

It is an amenable number.

199997768 is a deficient number, since it is larger than the sum of its proper divisors (175513912).

199997768 is a wasteful number, since it uses less digits than its factorization.

199997768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34396 (or 34392 counting only the distinct ones).

The product of its digits is 15431472, while the sum is 65.

The square root of 199997768 is about 14142.0567103940. The cubic root of 199997768 is about 584.8013721653.

The spelling of 199997768 in words is "one hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred sixty-eight".