1280711856 has 20 divisors (see below), whose sum is σ = 3308505752. Its totient is φ = 426903936.

The previous prime is 1280711827. The next prime is 1280711857. The reversal of 1280711856 is 6581170821.

It is a super-3 number, since 3×1280711856³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1280711857) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13340701 + ... + 13340796.

Almost surely, 2^1280711856 is an apocalyptic number.

1280711856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1280711856 is an abundant number, since it is smaller than the sum of its proper divisors (2027793896).

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

1280711856 is a wasteful number, since it uses less digits than its factorization.

1280711856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26681508 (or 26681502 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 39.

The square root of 1280711856 is about 35787.0347472377. The cubic root of 1280711856 is about 1085.9682879269.

The spelling of 1280711856 in words is "one billion, two hundred eighty million, seven hundred eleven thousand, eight hundred fifty-six".