19985493528 has 480 divisors, whose sum is σ = 75755544480. Its totient is φ = 4790016000.

The previous prime is 19985493511. The next prime is 19985493551. The reversal of 19985493528 is 82539458991.

19985493528 is a `hidden beast` number, since 1 + 9 + 98 + 5 + 493 + 52 + 8 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 7133728 + ... + 7136528.

It is an arithmetic number, because the mean of its divisors is an integer number (157824051).

Almost surely, 2^19985493528 is an apocalyptic number.

19985493528 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 19985493528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37877772240).

19985493528 is an abundant number, since it is smaller than the sum of its proper divisors (55770050952).

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

19985493528 is a wasteful number, since it uses less digits than its factorization.

19985493528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861 (or 2837 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 63.

The spelling of 19985493528 in words is "nineteen billion, nine hundred eighty-five million, four hundred ninety-three thousand, five hundred twenty-eight".