1089889320 has 192 divisors, whose sum is σ = 3643436160. Its totient is φ = 259269120.

The previous prime is 1089889319. The next prime is 1089889321. The reversal of 1089889320 is 239889801.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1089889319) and next prime (1089889321).

It is a self number, because there is not a number n which added to its sum of digits gives 1089889320.

It is not an unprimeable number, because it can be changed into a prime (1089889321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1498797 + ... + 1499523.

It is an arithmetic number, because the mean of its divisors is an integer number (18976230).

Almost surely, 2^1089889320 is an apocalyptic number.

1089889320 is a gapful number since it is divisible by the number (10) 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 1089889320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1821718080).

1089889320 is an abundant number, since it is smaller than the sum of its proper divisors (2553546840).

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

1089889320 is a wasteful number, since it uses less digits than its factorization.

1089889320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 1089889320 is about 33013.4717956170. The cubic root of 1089889320 is about 1029.1076319098.

The spelling of 1089889320 in words is "one billion, eighty-nine million, eight hundred eighty-nine thousand, three hundred twenty".