199971728 has 20 divisors (see below), whose sum is σ = 422667888. Its totient is φ = 90896160.

The previous prime is 199971691. The next prime is 199971743. The reversal of 199971728 is 827179991.

It is a self number, because there is not a number n which added to its sum of digits gives 199971728.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567926 + ... + 568277.

Almost surely, 2^199971728 is an apocalyptic number.

It is an amenable number.

199971728 is an abundant number, since it is smaller than the sum of its proper divisors (222696160).

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

199971728 is a wasteful number, since it uses less digits than its factorization.

199971728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136222 (or 1136216 counting only the distinct ones).

The product of its digits is 571536, while the sum is 53.

The square root of 199971728 is about 14141.1360222579. The cubic root of 199971728 is about 584.7759904009.

The spelling of 199971728 in words is "one hundred ninety-nine million, nine hundred seventy-one thousand, seven hundred twenty-eight".