199678768 has 20 divisors (see below), whose sum is σ = 390869080. Its totient is φ = 98809344.

The previous prime is 199678697. The next prime is 199678769. The reversal of 199678768 is 867876991.

It is a super-2 number, since 2×199678768² = 79743220779995648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199678769) 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, 62778 + ... + 65881.

It is an arithmetic number, because the mean of its divisors is an integer number (19543454).

Almost surely, 2^199678768 is an apocalyptic number.

It is an amenable number.

199678768 is a deficient number, since it is larger than the sum of its proper divisors (191190312).

199678768 is a wasteful number, since it uses less digits than its factorization.

199678768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128764 (or 128758 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 61.

The square root of 199678768 is about 14130.7737933915. The cubic root of 199678768 is about 584.4902838434.

The spelling of 199678768 in words is "one hundred ninety-nine million, six hundred seventy-eight thousand, seven hundred sixty-eight".