989258489856 has 1344 divisors, whose sum is σ = 3761624875008. Its totient is φ = 252829237248.

The previous prime is 989258489789. The next prime is 989258489861. The reversal of 989258489856 is 658984852989.

989258489856 is a `hidden beast` number, since 9 + 8 + 9 + 2 + 58 + 489 + 85 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7789436865 + ... + 7789436991.

It is an arithmetic number, because the mean of its divisors is an integer number (2798828032).

Almost surely, 2^989258489856 is an apocalyptic number.

989258489856 is a gapful number since it is divisible by the number (96) 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 989258489856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1880812437504).

989258489856 is an abundant number, since it is smaller than the sum of its proper divisors (2772366385152).

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

989258489856 is a wasteful number, since it uses less digits than its factorization.

989258489856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 195 counting only the distinct ones).

The product of its digits is 3583180800, while the sum is 81.

The spelling of 989258489856 in words is "nine hundred eighty-nine billion, two hundred fifty-eight million, four hundred eighty-nine thousand, eight hundred fifty-six".