280504368 has 90 divisors (see below), whose sum is σ = 811563012. Its totient is φ = 90440640.

The previous prime is 280504361. The next prime is 280504373. The reversal of 280504368 is 863405082.

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

It is not an unprimeable number, because it can be changed into a prime (280504361) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 137371 + ... + 139397.

Almost surely, 2^280504368 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 280504368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (405781506).

280504368 is an abundant number, since it is smaller than the sum of its proper divisors (531058644).

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

280504368 is a wasteful number, since it uses less digits than its factorization.

280504368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2103 (or 2063 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 280504368 is about 16748.2646265218. The cubic root of 280504368 is about 654.6058409776.

The spelling of 280504368 in words is "two hundred eighty million, five hundred four thousand, three hundred sixty-eight".