1289409264 has 120 divisors (see below), whose sum is σ = 4239489072. Its totient is φ = 360668160.

The previous prime is 1289409241. The next prime is 1289409271. The reversal of 1289409264 is 4629049821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10717 + ... + 51900.

Almost surely, 2^1289409264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1289409264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119744536).

1289409264 is an abundant number, since it is smaller than the sum of its proper divisors (2950079808).

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

1289409264 is a wasteful number, since it uses less digits than its factorization.

1289409264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62655 (or 62646 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1289409264 is about 35908.3453252862. The cubic root of 1289409264 is about 1088.4210407258.

The spelling of 1289409264 in words is "one billion, two hundred eighty-nine million, four hundred nine thousand, two hundred sixty-four".