1280909088 has 144 divisors (see below), whose sum is σ = 3832448256. Its totient is φ = 405250560.

The previous prime is 1280909059. The next prime is 1280909089. The reversal of 1280909088 is 8809090821.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (1280909089) 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 23 ways as a sum of consecutive naturals, for example, 471831 + ... + 474537.

It is an arithmetic number, because the mean of its divisors is an integer number (26614224).

Almost surely, 2^1280909088 is an apocalyptic number.

1280909088 is a gapful number since it is divisible by the number (18) 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 1280909088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1916224128).

1280909088 is an abundant number, since it is smaller than the sum of its proper divisors (2551539168).

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

1280909088 is a wasteful number, since it uses less digits than its factorization.

1280909088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807 (or 2796 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 1280909088 is about 35789.7902759991. The cubic root of 1280909088 is about 1086.0240321086.

The spelling of 1280909088 in words is "one billion, two hundred eighty million, nine hundred nine thousand, eighty-eight".