1281085008 has 120 divisors (see below), whose sum is σ = 3863199168. Its totient is φ = 364750848.

The previous prime is 1281084979. The next prime is 1281085009. The reversal of 1281085008 is 8005801821.

It is a self number, because there is not a number n which added to its sum of digits gives 1281085008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281085009) 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, 829485 + ... + 831027.

Almost surely, 2^1281085008 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 1281085008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1931599584).

1281085008 is an abundant number, since it is smaller than the sum of its proper divisors (2582114160).

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

1281085008 is a wasteful number, since it uses less digits than its factorization.

1281085008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921 (or 1908 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 1281085008 is about 35792.2478757621. The cubic root of 1281085008 is about 1086.0737479976.

Adding to 1281085008 its reverse (8005801821), we get a palindrome (9286886829).

The spelling of 1281085008 in words is "one billion, two hundred eighty-one million, eighty-five thousand, eight".