989816781960 has 96 divisors (see below), whose sum is σ = 3218102236440. Its totient is φ = 263852869632.

The previous prime is 989816781953. The next prime is 989816782001. The reversal of 989816781960 is 69187618989.

It can be written as a sum of positive squares in 4 ways, for example, as 432193167396 + 557623614564 = 657414^2 + 746742^2 .

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 23 ways as a sum of consecutive naturals, for example, 458992 + ... + 1479968.

Almost surely, 2^989816781960 is an apocalyptic number.

989816781960 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

989816781960 is an abundant number, since it is smaller than the sum of its proper divisors (2228285454480).

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

989816781960 is a wasteful number, since it uses less digits than its factorization.

989816781960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023687 (or 1023680 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 72.

The spelling of 989816781960 in words is "nine hundred eighty-nine billion, eight hundred sixteen million, seven hundred eighty-one thousand, nine hundred sixty".