198373894128 has 160 divisors (see below), whose sum is σ = 580409280000. Its totient is φ = 64852144128.

The previous prime is 198373894127. The next prime is 198373894153. The reversal of 198373894128 is 821498373891.

198373894128 is a `hidden beast` number, since 198 + 3 + 7 + 389 + 41 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198373894127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11180368 + ... + 11198096.

It is an arithmetic number, because the mean of its divisors is an integer number (3627558000).

Almost surely, 2^198373894128 is an apocalyptic number.

198373894128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198373894128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290204640000).

198373894128 is an abundant number, since it is smaller than the sum of its proper divisors (382035385872).

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

198373894128 is a wasteful number, since it uses less digits than its factorization.

198373894128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18244 (or 18232 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 198373894128 in words is "one hundred ninety-eight billion, three hundred seventy-three million, eight hundred ninety-four thousand, one hundred twenty-eight".