1998285703728 has 20 divisors (see below), whose sum is σ = 5162238068088. Its totient is φ = 666095234560.

The previous prime is 1998285703727. The next prime is 1998285703781. The reversal of 1998285703728 is 8273075828991.

It is not an unprimeable number, because it can be changed into a prime (1998285703721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20815476033 + ... + 20815476128.

Almost surely, 2^{1998285703728} is an apocalyptic number.

It is an amenable number.

1998285703728 is an abundant number, since it is smaller than the sum of its proper divisors (3163952364360).

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

1998285703728 is a wasteful number, since it uses less digits than its factorization.

1998285703728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41630952172 (or 41630952166 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 69.

The spelling of 1998285703728 in words is "one trillion, nine hundred ninety-eight billion, two hundred eighty-five million, seven hundred three thousand, seven hundred twenty-eight".