280008560 has 80 divisors (see below), whose sum is σ = 704184096. Its totient is φ = 102933504.

The previous prime is 280008559. The next prime is 280008569. The reversal of 280008560 is 65800082.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280008569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318842 + ... + 319718.

Almost surely, 2^280008560 is an apocalyptic number.

280008560 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 280008560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352092048).

280008560 is an abundant number, since it is smaller than the sum of its proper divisors (424175536).

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

280008560 is a wasteful number, since it uses less digits than its factorization.

280008560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210 (or 1204 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 280008560 is about 16733.4563076491. The cubic root of 280008560 is about 654.2199287145.

The spelling of 280008560 in words is "two hundred eighty million, eight thousand, five hundred sixty".