199917568 has 32 divisors (see below), whose sum is σ = 399894570. Its totient is φ = 99942400.

The previous prime is 199917551. The next prime is 199917593. The reversal of 199917568 is 865719991.

It can be written as a sum of positive squares in only one way, i.e., 160579584 + 39337984 = 12672^2 + 6272^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29718 + ... + 35818.

Almost surely, 2^199917568 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 199917568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199947285).

199917568 is an abundant number, since it is smaller than the sum of its proper divisors (199977002).

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

199917568 is an frugal number, since it uses more digits than its factorization.

199917568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131 (or 6103 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 55.

The square root of 199917568 is about 14139.2209120588. The cubic root of 199917568 is about 584.7231923918.

The spelling of 199917568 in words is "one hundred ninety-nine million, nine hundred seventeen thousand, five hundred sixty-eight".