280944880 has 60 divisors (see below), whose sum is σ = 663272280. Its totient is φ = 110670336.

The previous prime is 280944877. The next prime is 280944899. The reversal of 280944880 is 88449082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 425991 + ... + 426649.

It is an arithmetic number, because the mean of its divisors is an integer number (11054538).

Almost surely, 2^280944880 is an apocalyptic number.

280944880 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 280944880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331636140).

280944880 is an abundant number, since it is smaller than the sum of its proper divisors (382327400).

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

280944880 is an equidigital number, since it uses as much as digits as its factorization.

280944880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 739 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 43.

The square root of 280944880 is about 16761.4104418453. The cubic root of 280944880 is about 654.9483322685.

The spelling of 280944880 in words is "two hundred eighty million, nine hundred forty-four thousand, eight hundred eighty".