1280280000 has 280 divisors, whose sum is σ = 4342010112. Its totient is φ = 332672000.

The previous prime is 1280279993. The next prime is 1280280049. The reversal of 1280280000 is 820821.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 5639887 + ... + 5640113.

Almost surely, 2^1280280000 is an apocalyptic number.

1280280000 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 1280280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2171005056).

1280280000 is an abundant number, since it is smaller than the sum of its proper divisors (3061730112).

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

1280280000 is an equidigital number, since it uses as much as digits as its factorization.

1280280000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 1280280000 is about 35781.0005449820. Note that the first 3 decimals coincide. The cubic root of 1280280000 is about 1085.8462113796.

The spelling of 1280280000 in words is "one billion, two hundred eighty million, two hundred eighty thousand".