1286781828 has 48 divisors (see below), whose sum is σ = 3136398720. Its totient is φ = 409837824.

The previous prime is 1286781817. The next prime is 1286781829. The reversal of 1286781828 is 8281876821.

It is not an unprimeable number, because it can be changed into a prime (1286781829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339528 + ... + 343296.

It is an arithmetic number, because the mean of its divisors is an integer number (65341640).

Almost surely, 2^1286781828 is an apocalyptic number.

It is an amenable number.

1286781828 is an abundant number, since it is smaller than the sum of its proper divisors (1849616892).

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

1286781828 is a wasteful number, since it uses less digits than its factorization.

1286781828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5036 (or 5034 counting only the distinct ones).

The product of its digits is 688128, while the sum is 51.

The square root of 1286781828 is about 35871.7413572299. The cubic root of 1286781828 is about 1087.6812442535.

The spelling of 1286781828 in words is "one billion, two hundred eighty-six million, seven hundred eighty-one thousand, eight hundred twenty-eight".