1296655776 has 288 divisors, whose sum is σ = 4191602688. Its totient is φ = 391910400.

The previous prime is 1296655727. The next prime is 1296655783. The reversal of 1296655776 is 6775566921.

1296655776 is a `hidden beast` number, since 1 + 2 + 9 + 6 + 65 + 577 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10209825 + ... + 10209951.

It is an arithmetic number, because the mean of its divisors is an integer number (14554176).

Almost surely, 2^1296655776 is an apocalyptic number.

1296655776 is a gapful number since it is divisible by the number (16) 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 1296655776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2095801344).

1296655776 is an abundant number, since it is smaller than the sum of its proper divisors (2894946912).

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

1296655776 is a wasteful number, since it uses less digits than its factorization.

1296655776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 246 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 54.

The square root of 1296655776 is about 36009.1068481294. The cubic root of 1296655776 is about 1090.4562172954.

The spelling of 1296655776 in words is "one billion, two hundred ninety-six million, six hundred fifty-five thousand, seven hundred seventy-six".