1989885864960 has 1408 divisors, whose sum is σ = 8353489305600. Its totient is φ = 445317709824.

The previous prime is 1989885864937. The next prime is 1989885864971. The reversal of 1989885864960 is 694685889891.

It is a Smith number, since the sum of its digits (81) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 1989885864960.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4154250001 + ... + 4154250479.

Almost surely, 2^{1989885864960} is an apocalyptic number.

1989885864960 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 1989885864960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4176744652800).

1989885864960 is an abundant number, since it is smaller than the sum of its proper divisors (6363603440640).

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

1989885864960 is an frugal number, since it uses more digits than its factorization.

1989885864960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 2149908480, while the sum is 81.

The spelling of 1989885864960 in words is "one trillion, nine hundred eighty-nine billion, eight hundred eighty-five million, eight hundred sixty-four thousand, nine hundred sixty".