280648256 has 56 divisors (see below), whose sum is σ = 653710656. Its totient is φ = 117020160.

The previous prime is 280648253. The next prime is 280648273. The reversal of 280648256 is 652846082.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (280648253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8111 + ... + 25041.

Almost surely, 2^280648256 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 280648256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326855328).

280648256 is an abundant number, since it is smaller than the sum of its proper divisors (373062400).

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

280648256 is a wasteful number, since it uses less digits than its factorization.

280648256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16987 (or 16977 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The square root of 280648256 is about 16752.5596850153. The cubic root of 280648256 is about 654.7177510882.

The spelling of 280648256 in words is "two hundred eighty million, six hundred forty-eight thousand, two hundred fifty-six".