280583728 has 40 divisors (see below), whose sum is σ = 576371840. Its totient is φ = 132088320.

The previous prime is 280583711. The next prime is 280583731. The reversal of 280583728 is 827385082.

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 7 ways as a sum of consecutive naturals, for example, 10708 + ... + 25996.

It is an arithmetic number, because the mean of its divisors is an integer number (14409296).

Almost surely, 2^280583728 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 280583728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288185920).

280583728 is an abundant number, since it is smaller than the sum of its proper divisors (295788112).

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

280583728 is a wasteful number, since it uses less digits than its factorization.

280583728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15365 (or 15359 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 280583728 is about 16750.6336596560. The cubic root of 280583728 is about 654.6675686214.

The spelling of 280583728 in words is "two hundred eighty million, five hundred eighty-three thousand, seven hundred twenty-eight".