280385560 has 64 divisors (see below), whose sum is σ = 776462400. Its totient is φ = 88736256.

The previous prime is 280385557. The next prime is 280385621. The reversal of 280385560 is 65583082.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 34875 + ... + 42154.

It is an arithmetic number, because the mean of its divisors is an integer number (12132225).

Almost surely, 2^280385560 is an apocalyptic number.

280385560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280385560 is an abundant number, since it is smaller than the sum of its proper divisors (496076840).

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

280385560 is a wasteful number, since it uses less digits than its factorization.

280385560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77060 (or 77056 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 280385560 is about 16744.7173759368. The cubic root of 280385560 is about 654.5134082000.

The spelling of 280385560 in words is "two hundred eighty million, three hundred eighty-five thousand, five hundred sixty".