198016778 has 16 divisors (see below), whose sum is σ = 307564800. Its totient is φ = 95515200.

The previous prime is 198016771. The next prime is 198016787. The reversal of 198016778 is 877610891.

It is not an unprimeable number, because it can be changed into a prime (198016771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15698 + ... + 25346.

It is an arithmetic number, because the mean of its divisors is an integer number (19222800).

Almost surely, 2^198016778 is an apocalyptic number.

198016778 is a deficient number, since it is larger than the sum of its proper divisors (109548022).

198016778 is a wasteful number, since it uses less digits than its factorization.

198016778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10013.

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 198016778 is about 14071.8434471110. The cubic root of 198016778 is about 582.8641308537.

The spelling of 198016778 in words is "one hundred ninety-eight million, sixteen thousand, seven hundred seventy-eight".