280555280 has 40 divisors (see below), whose sum is σ = 674789400. Its totient is φ = 108351488.

The previous prime is 280555271. The next prime is 280555321. The reversal of 280555280 is 82555082.

It can be written as a sum of positive squares in 4 ways, for example, as 68095504 + 212459776 = 8252^2 + 14576^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×280555280² = 157422530271756800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 280555280.

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 7 ways as a sum of consecutive naturals, for example, 58145 + ... + 62784.

It is an arithmetic number, because the mean of its divisors is an integer number (16869735).

Almost surely, 2^280555280 is an apocalyptic number.

280555280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280555280 is an abundant number, since it is smaller than the sum of its proper divisors (394234120).

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

280555280 is a wasteful number, since it uses less digits than its factorization.

280555280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120971 (or 120965 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 35.

The square root of 280555280 is about 16749.7844762254. The cubic root of 280555280 is about 654.6454425908.

It can be divided in two parts, 2805 and 55280, that added together give a palindrome (58085).

The spelling of 280555280 in words is "two hundred eighty million, five hundred fifty-five thousand, two hundred eighty".