198878636 has 24 divisors (see below), whose sum is σ = 392772240. Its totient is φ = 87281600.

The previous prime is 198878527. The next prime is 198878639. The reversal of 198878636 is 636878891.

It is a happy number.

198878636 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (198878639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76655 + ... + 79206.

It is an arithmetic number, because the mean of its divisors is an integer number (16365510).

Almost surely, 2^198878636 is an apocalyptic number.

It is an amenable number.

198878636 is a deficient number, since it is larger than the sum of its proper divisors (193893604).

198878636 is a wasteful number, since it uses less digits than its factorization.

198878636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155905 (or 155903 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 56.

The square root of 198878636 is about 14102.4336906791. The cubic root of 198878636 is about 583.7085358318.

The spelling of 198878636 in words is "one hundred ninety-eight million, eight hundred seventy-eight thousand, six hundred thirty-six".