198311768 has 8 divisors (see below), whose sum is σ = 371834580. Its totient is φ = 99155880.

The previous prime is 198311761. The next prime is 198311807. The reversal of 198311768 is 867113891.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198311761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12394478 + ... + 12394493.

Almost surely, 2^198311768 is an apocalyptic number.

It is an amenable number.

198311768 is a deficient number, since it is larger than the sum of its proper divisors (173522812).

198311768 is a wasteful number, since it uses less digits than its factorization.

198311768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24788977 (or 24788973 counting only the distinct ones).

The product of its digits is 72576, while the sum is 44.

The square root of 198311768 is about 14082.3211154980. The cubic root of 198311768 is about 583.1534224680.

The spelling of 198311768 in words is "one hundred ninety-eight million, three hundred eleven thousand, seven hundred sixty-eight".