198500078 has 12 divisors (see below), whose sum is σ = 346362552. Its totient is φ = 85071420.

The previous prime is 198500069. The next prime is 198500089. The reversal of 198500078 is 870005891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1012658 + ... + 1012853.

It is an arithmetic number, because the mean of its divisors is an integer number (28863546).

Almost surely, 2^198500078 is an apocalyptic number.

198500078 is a deficient number, since it is larger than the sum of its proper divisors (147862474).

198500078 is a wasteful number, since it uses less digits than its factorization.

198500078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025527 (or 2025520 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 198500078 is about 14089.0055717215. The cubic root of 198500078 is about 583.3379448524.

The spelling of 198500078 in words is "one hundred ninety-eight million, five hundred thousand, seventy-eight".