1296066784 has 48 divisors (see below), whose sum is σ = 2681643888. Its totient is φ = 615831552.

The previous prime is 1296066769. The next prime is 1296066797. The reversal of 1296066784 is 4876606921.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38184 + ... + 63640.

It is an arithmetic number, because the mean of its divisors is an integer number (55867581).

Almost surely, 2^1296066784 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 1296066784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1340821944).

1296066784 is an abundant number, since it is smaller than the sum of its proper divisors (1385577104).

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

1296066784 is a wasteful number, since it uses less digits than its factorization.

1296066784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25547 (or 25539 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 1296066784 is about 36000.9275436064. The cubic root of 1296066784 is about 1090.2910829365.

The spelling of 1296066784 in words is "one billion, two hundred ninety-six million, sixty-six thousand, seven hundred eighty-four".