198854281728 has 120 divisors (see below), whose sum is σ = 598859715168. Its totient is φ = 63402780672.

The previous prime is 198854281727. The next prime is 198854281729. The reversal of 198854281728 is 827182458891.

198854281728 is a `hidden beast` number, since 1 + 9 + 8 + 8 + 542 + 81 + 7 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (198854281727) and next prime (198854281729).

It is not an unprimeable number, because it can be changed into a prime (198854281727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 832150 + ... + 1044117.

Almost surely, 2^198854281728 is an apocalyptic number.

198854281728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

198854281728 is an abundant number, since it is smaller than the sum of its proper divisors (400005433440).

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

198854281728 is a wasteful number, since it uses less digits than its factorization.

198854281728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876314 (or 1876295 counting only the distinct ones).

The product of its digits is 20643840, while the sum is 63.

The spelling of 198854281728 in words is "one hundred ninety-eight billion, eight hundred fifty-four million, two hundred eighty-one thousand, seven hundred twenty-eight".