198021460278 has 32 divisors (see below), whose sum is σ = 396778580352. Its totient is φ = 65884608000.

The previous prime is 198021460229. The next prime is 198021460279. The reversal of 198021460278 is 872064120891.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198021460279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18516913 + ... + 18527603.

It is an arithmetic number, because the mean of its divisors is an integer number (12399330636).

Almost surely, 2^198021460278 is an apocalyptic number.

198021460278 is an abundant number, since it is smaller than the sum of its proper divisors (198757120074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198021460278 is a wasteful number, since it uses less digits than its factorization.

198021460278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16140.

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 198021460278 in words is "one hundred ninety-eight billion, twenty-one million, four hundred sixty thousand, two hundred seventy-eight".