280385215 has 16 divisors (see below), whose sum is σ = 367994016. Its totient is φ = 203392000.

The previous prime is 280385213. The next prime is 280385243. The reversal of 280385215 is 512583082.

It is not a de Polignac number, because 280385215 - 2¹ = 280385213 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 (280385213) 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 15 ways as a sum of consecutive naturals, for example, 15699 + ... + 28411.

It is an arithmetic number, because the mean of its divisors is an integer number (22999626).

Almost surely, 2^280385215 is an apocalyptic number.

280385215 is a deficient number, since it is larger than the sum of its proper divisors (87608801).

280385215 is a wasteful number, since it uses less digits than its factorization.

280385215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13130.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 280385215 is about 16744.7070741772. The cubic root of 280385215 is about 654.5131397516.

The spelling of 280385215 in words is "two hundred eighty million, three hundred eighty-five thousand, two hundred fifteen".