280085328 has 60 divisors (see below), whose sum is σ = 785559840. Its totient is φ = 93158208.

The previous prime is 280085321. The next prime is 280085347. The reversal of 280085328 is 823580082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 280085292 and 280085301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280085321) 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 11 ways as a sum of consecutive naturals, for example, 73453 + ... + 77171.

It is an arithmetic number, because the mean of its divisors is an integer number (13092664).

Almost surely, 2^280085328 is an apocalyptic number.

It is an amenable number.

280085328 is an abundant number, since it is smaller than the sum of its proper divisors (505474512).

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

280085328 is a wasteful number, since it uses less digits than its factorization.

280085328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256 (or 4247 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 280085328 is about 16735.7499981327. The cubic root of 280085328 is about 654.2797108945.

The spelling of 280085328 in words is "two hundred eighty million, eighty-five thousand, three hundred twenty-eight".