1281268800 has 672 divisors, whose sum is σ = 5644083200. Its totient is φ = 276203520.

The previous prime is 1281268777. The next prime is 1281268811. The reversal of 1281268800 is 88621821.

It is a tau number, because it is divible by the number of its divisors (672).

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

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 95 ways as a sum of consecutive naturals, for example, 5745489 + ... + 5745711.

Almost surely, 2^1281268800 is an apocalyptic number.

1281268800 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 1281268800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2822041600).

1281268800 is an abundant number, since it is smaller than the sum of its proper divisors (4362814400).

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

1281268800 is a wasteful number, since it uses less digits than its factorization.

1281268800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 1281268800 is about 35794.8152670188. The cubic root of 1281268800 is about 1086.1256836927.

The spelling of 1281268800 in words is "one billion, two hundred eighty-one million, two hundred sixty-eight thousand, eight hundred".