1989787804416 has 720 divisors, whose sum is σ = 6267734272800. Its totient is φ = 627168116736.

The previous prime is 1989787804273. The next prime is 1989787804421. The reversal of 1989787804416 is 6144087879891.

1989787804416 is a `hidden beast` number, since 1 + 98 + 97 + 8 + 7 + 8 + 0 + 441 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5115135550 + ... + 5115135938.

It is an arithmetic number, because the mean of its divisors is an integer number (8705186490).

Almost surely, 2^{1989787804416} is an apocalyptic number.

1989787804416 is a gapful number since it is divisible by the number (16) 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 1989787804416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3133867136400).

1989787804416 is an abundant number, since it is smaller than the sum of its proper divisors (4277946468384).

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

1989787804416 is a wasteful number, since it uses less digits than its factorization.

1989787804416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 195084288, while the sum is 72.

The spelling of 1989787804416 in words is "one trillion, nine hundred eighty-nine billion, seven hundred eighty-seven million, eight hundred four thousand, four hundred sixteen".