989968865730 has 256 divisors, whose sum is σ = 2786603129856. Its totient is φ = 222816337920.

The previous prime is 989968865719. The next prime is 989968865737. The reversal of 989968865730 is 37568869989.

It is a super-2 number, since 2×989968865730² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is not an unprimeable number, because it can be changed into a prime (989968865737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 186678259 + ... + 186683561.

It is an arithmetic number, because the mean of its divisors is an integer number (10885168476).

Almost surely, 2^989968865730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989968865730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1393301564928).

989968865730 is an abundant number, since it is smaller than the sum of its proper divisors (1796634264126).

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

989968865730 is a wasteful number, since it uses less digits than its factorization.

989968865730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6141.

The product of its (nonzero) digits is 1410877440, while the sum is 78.

The spelling of 989968865730 in words is "nine hundred eighty-nine billion, nine hundred sixty-eight million, eight hundred sixty-five thousand, seven hundred thirty".