1989827497768 has 64 divisors (see below), whose sum is σ = 4122426369600. Its totient is φ = 892886353920.

The previous prime is 1989827497751. The next prime is 1989827497771. The reversal of 1989827497768 is 8677947289891.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3095203 + ... + 3682381.

It is an arithmetic number, because the mean of its divisors is an integer number (64412912025).

Almost surely, 2^{1989827497768} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989827497768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2061213184800).

1989827497768 is an abundant number, since it is smaller than the sum of its proper divisors (2132598871832).

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

1989827497768 is a wasteful number, since it uses less digits than its factorization.

1989827497768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587690 (or 587686 counting only the distinct ones).

The product of its digits is 6145155072, while the sum is 85.

The spelling of 1989827497768 in words is "one trillion, nine hundred eighty-nine billion, eight hundred twenty-seven million, four hundred ninety-seven thousand, seven hundred sixty-eight".