280280 has 96 divisors (see below), whose sum is σ = 861840. Its totient is φ = 80640.

The previous prime is 280277. The next prime is 280297. The reversal of 280280 is 82082.

280280 = T₁₅ + T₁₆ + ... + T₁₁₈.

280280 = 15² + 16² + ... + 94².

280280 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21554 + ... + 21566.

2²⁸⁰²⁸⁰ is an apocalyptic number.

280280 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 280280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (430920).

280280 is an abundant number, since it is smaller than the sum of its proper divisors (581560).

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

280280 is a wasteful number, since it uses less digits than its factorization.

280280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 280280 is about 529.4147712333. The cubic root of 280280 is about 65.4431260475.

It can be divided in two parts, 2802 and 80, that added together give a palindrome (2882).

The spelling of 280280 in words is "two hundred eighty thousand, two hundred eighty".