1989182667780 has 768 divisors, whose sum is σ = 8189217792000. Its totient is φ = 391563279360.

The previous prime is 1989182667713. The next prime is 1989182667821. The reversal of 1989182667780 is 877662819891.

It is a junction number, because it is equal to n+sod(n) for n = 1989182667699 and 1989182667708.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 95582016 + ... + 95602824.

It is an arithmetic number, because the mean of its divisors is an integer number (10663044000).

Almost surely, 2^{1989182667780} is an apocalyptic number.

1989182667780 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 1989182667780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4094608896000).

1989182667780 is an abundant number, since it is smaller than the sum of its proper divisors (6200035124220).

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

1989182667780 is a wasteful number, since it uses less digits than its factorization.

1989182667780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20886 (or 20856 counting only the distinct ones).

The product of its (nonzero) digits is 146313216, while the sum is 72.

The spelling of 1989182667780 in words is "one trillion, nine hundred eighty-nine billion, one hundred eighty-two million, six hundred sixty-seven thousand, seven hundred eighty".