1280340780 has 48 divisors (see below), whose sum is σ = 3587238144. Its totient is φ = 341206720.

The previous prime is 1280340757. The next prime is 1280340811. The reversal of 1280340780 is 870430821.

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 15 ways as a sum of consecutive naturals, for example, 102769 + ... + 114551.

It is an arithmetic number, because the mean of its divisors is an integer number (74734128).

Almost surely, 2^1280340780 is an apocalyptic number.

1280340780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280340780 is an abundant number, since it is smaller than the sum of its proper divisors (2306897364).

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

1280340780 is a wasteful number, since it uses less digits than its factorization.

1280340780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13606 (or 13604 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 1280340780 is about 35781.8498683341. The cubic root of 1280340780 is about 1085.8633942585.

The spelling of 1280340780 in words is "one billion, two hundred eighty million, three hundred forty thousand, seven hundred eighty".