1281336720 has 80 divisors (see below), whose sum is σ = 4037307072. Its totient is φ = 336084480.

The previous prime is 1281336713. The next prime is 1281336731. The reversal of 1281336720 is 276331821.

1281336720 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29122 + ... + 58401.

Almost surely, 2^1281336720 is an apocalyptic number.

1281336720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281336720 is an abundant number, since it is smaller than the sum of its proper divisors (2755970352).

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

1281336720 is a wasteful number, since it uses less digits than its factorization.

1281336720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87600 (or 87594 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 1281336720 is about 35795.7639951992. The cubic root of 1281336720 is about 1086.1448751777.

The spelling of 1281336720 in words is "one billion, two hundred eighty-one million, three hundred thirty-six thousand, seven hundred twenty".