1998887694720 has 768 divisors, whose sum is σ = 7648112102400. Its totient is φ = 434954944512.

The previous prime is 1998887694719. The next prime is 1998887694731. The reversal of 1998887694720 is 274967888991.

It is a super-2 number, since 2×1998887694720² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1869866346 + ... + 1869867414.

It is an arithmetic number, because the mean of its divisors is an integer number (9958479300).

Almost surely, 2^{1998887694720} is an apocalyptic number.

1998887694720 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 1998887694720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3824056051200).

1998887694720 is an abundant number, since it is smaller than the sum of its proper divisors (5649224407680).

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

1998887694720 is a wasteful number, since it uses less digits than its factorization.

1998887694720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407 (or 1372 counting only the distinct ones).

The product of its (nonzero) digits is 877879296, while the sum is 78.

The spelling of 1998887694720 in words is "one trillion, nine hundred ninety-eight billion, eight hundred eighty-seven million, six hundred ninety-four thousand, seven hundred twenty".