280855260 has 144 divisors (see below), whose sum is σ = 993720000. Its totient is φ = 64181376.

The previous prime is 280855247. The next prime is 280855261. The reversal of 280855260 is 62558082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280855261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59466 + ... + 64014.

Almost surely, 2^280855260 is an apocalyptic number.

280855260 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 280855260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (496860000).

280855260 is an abundant number, since it is smaller than the sum of its proper divisors (712864740).

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

280855260 is a wasteful number, since it uses less digits than its factorization.

280855260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4585 (or 4566 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 280855260 is about 16758.7368259067. The cubic root of 280855260 is about 654.8786831236.

The spelling of 280855260 in words is "two hundred eighty million, eight hundred fifty-five thousand, two hundred sixty".