1286855280 has 120 divisors (see below), whose sum is σ = 4470785280. Its totient is φ = 331322880.

The previous prime is 1286855263. The next prime is 1286855357. The reversal of 1286855280 is 825586821.

1286855280 is a `hidden beast` number, since 12 + 8 + 6 + 8 + 552 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9936 + ... + 51695.

It is an arithmetic number, because the mean of its divisors is an integer number (37256544).

Almost surely, 2^1286855280 is an apocalyptic number.

1286855280 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 1286855280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2235392640).

1286855280 is an abundant number, since it is smaller than the sum of its proper divisors (3183930000).

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

1286855280 is a wasteful number, since it uses less digits than its factorization.

1286855280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61679 (or 61670 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The square root of 1286855280 is about 35872.7651568707. The cubic root of 1286855280 is about 1087.7019395107.

The spelling of 1286855280 in words is "one billion, two hundred eighty-six million, eight hundred fifty-five thousand, two hundred eighty".