198493787520 has 512 divisors, whose sum is σ = 825160089600. Its totient is φ = 44142796800.

The previous prime is 198493787519. The next prime is 198493787521. The reversal of 198493787520 is 25787394891.

198493787520 is a `hidden beast` number, since 1 + 9 + 8 + 493 + 78 + 75 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (198493787519) and next prime (198493787521).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198493787521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4453345 + ... + 4497695.

It is an arithmetic number, because the mean of its divisors is an integer number (1611640800).

Almost surely, 2^198493787520 is an apocalyptic number.

198493787520 is a gapful number since it is divisible by the number (10) 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 198493787520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412580044800).

198493787520 is an abundant number, since it is smaller than the sum of its proper divisors (626666302080).

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

198493787520 is a wasteful number, since it uses less digits than its factorization.

198493787520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44423 (or 44405 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 198493787520 in words is "one hundred ninety-eight billion, four hundred ninety-three million, seven hundred eighty-seven thousand, five hundred twenty".