280328863 has 4 divisors (see below), whose sum is σ = 280362520. Its totient is φ = 280295208.

The previous prime is 280328843. The next prime is 280328879. The reversal of 280328863 is 368823082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280328863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280328813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5881 + ... + 24397.

It is an arithmetic number, because the mean of its divisors is an integer number (70090630).

Almost surely, 2^280328863 is an apocalyptic number.

280328863 is a deficient number, since it is larger than the sum of its proper divisors (33657).

280328863 is a wasteful number, since it uses less digits than its factorization.

280328863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33656.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 280328863 is about 16743.0243086487. The cubic root of 280328863 is about 654.4692886571.

The spelling of 280328863 in words is "two hundred eighty million, three hundred twenty-eight thousand, eight hundred sixty-three".