280403555328 has 528 divisors, whose sum is σ = 957612801600. Its totient is φ = 81186914304.

The previous prime is 280403555323. The next prime is 280403555351. The reversal of 280403555328 is 823555304082.

280403555328 is a `hidden beast` number, since 2 + 8 + 0 + 40 + 35 + 553 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280403555323) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 54989323 + ... + 54994421.

Almost surely, 2^280403555328 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 280403555328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (478806400800).

280403555328 is an abundant number, since it is smaller than the sum of its proper divisors (677209246272).

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

280403555328 is a wasteful number, since it uses less digits than its factorization.

280403555328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5164 (or 5134 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

The spelling of 280403555328 in words is "two hundred eighty billion, four hundred three million, five hundred fifty-five thousand, three hundred twenty-eight".