199644688 has 10 divisors (see below), whose sum is σ = 386811614. Its totient is φ = 99822336.

The previous prime is 199644661. The next prime is 199644733. The reversal of 199644688 is 886446991.

It can be written as a sum of positive squares in only one way, i.e., 190108944 + 9535744 = 13788^2 + 3088^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6238881 + ... + 6238912.

Almost surely, 2^199644688 is an apocalyptic number.

It is an amenable number.

199644688 is a deficient number, since it is larger than the sum of its proper divisors (187166926).

199644688 is a wasteful number, since it uses less digits than its factorization.

199644688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12477801 (or 12477795 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 55.

The square root of 199644688 is about 14129.5678631726. The cubic root of 199644688 is about 584.4570294945.

The spelling of 199644688 in words is "one hundred ninety-nine million, six hundred forty-four thousand, six hundred eighty-eight".