280000505 has 8 divisors (see below), whose sum is σ = 350609472. Its totient is φ = 214261168.

The previous prime is 280000493. The next prime is 280000517. The reversal of 280000505 is 505000082.

It is an interprime number because it is at equal distance from previous prime (280000493) and next prime (280000517).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 280000505 - 2¹⁰ = 279999481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1217279 + ... + 1217508.

It is an arithmetic number, because the mean of its divisors is an integer number (43826184).

Almost surely, 2^280000505 is an apocalyptic number.

It is an amenable number.

280000505 is a deficient number, since it is larger than the sum of its proper divisors (70608967).

280000505 is a wasteful number, since it uses less digits than its factorization.

280000505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434815.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 280000505 is about 16733.2156204359. The cubic root of 280000505 is about 654.2136553443.

Adding to 280000505 its reverse (505000082), we get a palindrome (785000587).

The spelling of 280000505 in words is "two hundred eighty million, five hundred five", and thus it is an aban number.