1280918016 has 480 divisors, whose sum is σ = 4627560960. Its totient is φ = 348364800.

The previous prime is 1280917999. The next prime is 1280918017. The reversal of 1280918016 is 6108190821.

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

It is not an unprimeable number, because it can be changed into a prime (1280918017) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20998626 + ... + 20998686.

It is an arithmetic number, because the mean of its divisors is an integer number (9640752).

Almost surely, 2^1280918016 is an apocalyptic number.

1280918016 is a gapful number since it is divisible by the number (16) 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 1280918016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2313780480).

1280918016 is an abundant number, since it is smaller than the sum of its proper divisors (3346642944).

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

1280918016 is an equidigital number, since it uses as much as digits as its factorization.

1280918016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 1280918016 is about 35789.9150040902. The cubic root of 1280918016 is about 1086.0265553166.

The spelling of 1280918016 in words is "one billion, two hundred eighty million, nine hundred eighteen thousand, sixteen".