280720800 has 216 divisors, whose sum is σ = 1000935936. Its totient is φ = 74027520.

The previous prime is 280720799. The next prime is 280720861. The reversal of 280720800 is 8027082.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 914247 + ... + 914553.

Almost surely, 2^280720800 is an apocalyptic number.

280720800 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 280720800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (500467968).

280720800 is an abundant number, since it is smaller than the sum of its proper divisors (720215136).

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

280720800 is a wasteful number, since it uses less digits than its factorization.

280720800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 280720800 is about 16754.7247067805. The cubic root of 280720800 is about 654.7741582951.

Adding to 280720800 its reverse (8027082), we get a palindrome (288747882).

The spelling of 280720800 in words is "two hundred eighty million, seven hundred twenty thousand, eight hundred".