280320040 has 128 divisors (see below), whose sum is σ = 846961920. Its totient is φ = 80640000.

The previous prime is 280320037. The next prime is 280320059. The reversal of 280320040 is 40023082.

It is a happy number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 36540 + ... + 43540.

It is an arithmetic number, because the mean of its divisors is an integer number (6616890).

Almost surely, 2^280320040 is an apocalyptic number.

280320040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280320040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423480960).

280320040 is an abundant number, since it is smaller than the sum of its proper divisors (566641880).

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

280320040 is a wasteful number, since it uses less digits than its factorization.

280320040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043 (or 7039 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 280320040 is about 16742.7608237112. The cubic root of 280320040 is about 654.4624223846.

The spelling of 280320040 in words is "two hundred eighty million, three hundred twenty thousand, forty".