280505328 has 40 divisors (see below), whose sum is σ = 736525776. Its totient is φ = 91968000.

The previous prime is 280505317. The next prime is 280505333. The reversal of 280505328 is 823505082.

It is a congruent number.

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, 44973 + ... + 50828.

Almost surely, 2^280505328 is an apocalyptic number.

It is an amenable number.

280505328 is an abundant number, since it is smaller than the sum of its proper divisors (456020448).

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

280505328 is a wasteful number, since it uses less digits than its factorization.

280505328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95873 (or 95867 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 280505328 is about 16748.2932861829. The cubic root of 280505328 is about 654.6065877525.

The spelling of 280505328 in words is "two hundred eighty million, five hundred five thousand, three hundred twenty-eight".