989179845990 has 256 divisors, whose sum is σ = 2818577793024. Its totient is φ = 217413388800.

The previous prime is 989179845893. The next prime is 989179845991. The reversal of 989179845990 is 99548971989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989179845991) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 959436775 + ... + 959437805.

It is an arithmetic number, because the mean of its divisors is an integer number (11010069504).

Almost surely, 2^989179845990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989179845990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1409288896512).

989179845990 is an abundant number, since it is smaller than the sum of its proper divisors (1829397947034).

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

989179845990 is a wasteful number, since it uses less digits than its factorization.

989179845990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875.

The product of its (nonzero) digits is 529079040, while the sum is 78.

The spelling of 989179845990 in words is "nine hundred eighty-nine billion, one hundred seventy-nine million, eight hundred forty-five thousand, nine hundred ninety".