280000280 has 64 divisors (see below), whose sum is σ = 727202880. Its totient is φ = 95040000.

The previous prime is 280000267. The next prime is 280000337. The reversal of 280000280 is 82000082.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23330 + ... + 33230.

It is an arithmetic number, because the mean of its divisors is an integer number (11362545).

Almost surely, 2^280000280 is an apocalyptic number.

280000280 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 280000280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363601440).

280000280 is an abundant number, since it is smaller than the sum of its proper divisors (447202600).

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

280000280 is a wasteful number, since it uses less digits than its factorization.

280000280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10020 (or 10016 counting only the distinct ones).

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

The square root of 280000280 is about 16733.2088972797. The cubic root of 280000280 is about 654.2134801087.

It can be divided in two parts, 2800002 and 80, that added together give a palindrome (2800082).

The spelling of 280000280 in words is "two hundred eighty million, two hundred eighty", and thus it is an aban number.