1280860056 has 96 divisors (see below), whose sum is σ = 3977569440. Its totient is φ = 364760064.

The previous prime is 1280860051. The next prime is 1280860069. The reversal of 1280860056 is 6500680821.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1280860056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280860051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155760 + ... + 163776.

It is an arithmetic number, because the mean of its divisors is an integer number (41433015).

Almost surely, 2^1280860056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280860056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1988784720).

1280860056 is an abundant number, since it is smaller than the sum of its proper divisors (2696709384).

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

1280860056 is a wasteful number, since it uses less digits than its factorization.

1280860056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8353 (or 8346 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1280860056 is about 35789.1052696208. The cubic root of 1280860056 is about 1086.0101746043.

The spelling of 1280860056 in words is "one billion, two hundred eighty million, eight hundred sixty thousand, fifty-six".