1289608320 has 768 divisors, whose sum is σ = 5652138240. Its totient is φ = 243302400.

The previous prime is 1289608283. The next prime is 1289608351. The reversal of 1289608320 is 238069821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 21141090 + ... + 21141150.

It is an arithmetic number, because the mean of its divisors is an integer number (7359555).

Almost surely, 2^1289608320 is an apocalyptic number.

1289608320 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 1289608320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2826069120).

1289608320 is an abundant number, since it is smaller than the sum of its proper divisors (4362529920).

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

1289608320 is a wasteful number, since it uses less digits than its factorization.

1289608320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1289608320 is about 35911.1169416937. The cubic root of 1289608320 is about 1088.4770471459.

The spelling of 1289608320 in words is "one billion, two hundred eighty-nine million, six hundred eight thousand, three hundred twenty".