280561580 has 48 divisors (see below), whose sum is σ = 642194784. Its totient is φ = 102336000.

The previous prime is 280561571. The next prime is 280561609. The reversal of 280561580 is 85165082.

It is a happy number.

280561580 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 280561580.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15080 + ... + 28080.

It is an arithmetic number, because the mean of its divisors is an integer number (13379058).

Almost surely, 2^280561580 is an apocalyptic number.

280561580 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 280561580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321097392).

280561580 is an abundant number, since it is smaller than the sum of its proper divisors (361633204).

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

280561580 is a wasteful number, since it uses less digits than its factorization.

280561580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13106 (or 13104 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 280561580 is about 16749.9725372909. The cubic root of 280561580 is about 654.6503426773.

The spelling of 280561580 in words is "two hundred eighty million, five hundred sixty-one thousand, five hundred eighty".