1000321280 has 216 divisors, whose sum is σ = 2862601560. Its totient is φ = 333742080.

The previous prime is 1000321277. The next prime is 1000321303. The reversal of 1000321280 is 821230001.

1000321280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9834496 + 990486784 = 3136^2 + 31472^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2571326 + ... + 2571714.

It is an arithmetic number, because the mean of its divisors is an integer number (13252785).

Almost surely, 2^1000321280 is an apocalyptic number.

1000321280 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 1000321280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431300780).

1000321280 is an abundant number, since it is smaller than the sum of its proper divisors (1862280280).

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

1000321280 is an equidigital number, since it uses as much as digits as its factorization.

1000321280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1000321280 is about 31627.8560765664. The cubic root of 1000321280 is about 1000.1070818664.

Adding to 1000321280 its reverse (821230001), we get a palindrome (1821551281).

The spelling of 1000321280 in words is "one billion, three hundred twenty-one thousand, two hundred eighty".