280228320 has 144 divisors (see below), whose sum is σ = 997974432. Its totient is φ = 71470080.

The previous prime is 280228303. The next prime is 280228369. The reversal of 280228320 is 23822082.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×280228320² = 157055822660044800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28890 + ... + 37350.

It is an arithmetic number, because the mean of its divisors is an integer number (6930378).

Almost surely, 2^280228320 is an apocalyptic number.

280228320 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 280228320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (498987216).

280228320 is an abundant number, since it is smaller than the sum of its proper divisors (717746112).

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

280228320 is a wasteful number, since it uses less digits than its factorization.

280228320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8505 (or 8494 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 280228320 is about 16740.0215053625. The cubic root of 280228320 is about 654.3910351213.

The spelling of 280228320 in words is "two hundred eighty million, two hundred twenty-eight thousand, three hundred twenty".