280325638656 has 240 divisors, whose sum is σ = 925600186368. Its totient is φ = 80007782400.

The previous prime is 280325638573. The next prime is 280325638711. The reversal of 280325638656 is 656836523082.

280325638656 is a `hidden beast` number, since 2 + 8 + 0 + 3 + 256 + 386 + 5 + 6 = 666.

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 23 ways as a sum of consecutive naturals, for example, 34219521 + ... + 34227711.

Almost surely, 2^280325638656 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 280325638656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (462800093184).

280325638656 is an abundant number, since it is smaller than the sum of its proper divisors (645274547712).

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

280325638656 is a wasteful number, since it uses less digits than its factorization.

280325638656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9283 (or 9264 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 54.

The spelling of 280325638656 in words is "two hundred eighty billion, three hundred twenty-five million, six hundred thirty-eight thousand, six hundred fifty-six".