198346778 has 16 divisors (see below), whose sum is σ = 340203840. Its totient is φ = 84960576.

The previous prime is 198346763. The next prime is 198346787. The reversal of 198346778 is 877643891.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49058 + ... + 52946.

It is an arithmetic number, because the mean of its divisors is an integer number (21262740).

Almost surely, 2^198346778 is an apocalyptic number.

198346778 is a deficient number, since it is larger than the sum of its proper divisors (141857062).

198346778 is a wasteful number, since it uses less digits than its factorization.

198346778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7541.

The product of its digits is 2032128, while the sum is 53.

The square root of 198346778 is about 14083.5641085629. The cubic root of 198346778 is about 583.1877371235.

The spelling of 198346778 in words is "one hundred ninety-eight million, three hundred forty-six thousand, seven hundred seventy-eight".