1289240064 has 200 divisors, whose sum is σ = 4398752688. Its totient is φ = 368271360.

The previous prime is 1289240009. The next prime is 1289240087. The reversal of 1289240064 is 4600429821.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 288084 + ... + 292524.

Almost surely, 2^1289240064 is an apocalyptic number.

1289240064 is a gapful number since it is divisible by the number (14) 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 1289240064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2199376344).

1289240064 is an abundant number, since it is smaller than the sum of its proper divisors (3109512624).

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

1289240064 is an frugal number, since it uses more digits than its factorization.

1289240064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4478 (or 4453 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1289240064 is about 35905.9892497060. The cubic root of 1289240064 is about 1088.3734300612.

Adding to 1289240064 its reverse (4600429821), we get a palindrome (5889669885).

The spelling of 1289240064 in words is "one billion, two hundred eighty-nine million, two hundred forty thousand, sixty-four".