280808455 has 4 divisors (see below), whose sum is σ = 336970152. Its totient is φ = 224646760.

The previous prime is 280808441. The next prime is 280808459. The reversal of 280808455 is 554808082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554808082 = 2 ⋅277404041.

It is not a de Polignac number, because 280808455 - 2⁷ = 280808327 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280808459) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 28080841 + ... + 28080850.

It is an arithmetic number, because the mean of its divisors is an integer number (84242538).

Almost surely, 2^280808455 is an apocalyptic number.

280808455 is a deficient number, since it is larger than the sum of its proper divisors (56161697).

280808455 is an equidigital number, since it uses as much as digits as its factorization.

280808455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56161696.

The product of its (nonzero) digits is 102400, while the sum is 40.

The square root of 280808455 is about 16757.3403319262. The cubic root of 280808455 is about 654.8423022257.

The spelling of 280808455 in words is "two hundred eighty million, eight hundred eight thousand, four hundred fifty-five".