280870645 has 24 divisors (see below), whose sum is σ = 372956472. Its totient is φ = 202899840.

The previous prime is 280870627. The next prime is 280870669. The reversal of 280870645 is 546078082.

It can be written as a sum of positive squares in 4 ways, for example, as 576081 + 280294564 = 759^2 + 16742^2 .

It is not a de Polignac number, because 280870645 - 2¹⁹ = 280346357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 280870598 and 280870607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93507 + ... + 96463.

It is an arithmetic number, because the mean of its divisors is an integer number (15539853).

Almost surely, 2^280870645 is an apocalyptic number.

It is an amenable number.

280870645 is a deficient number, since it is larger than the sum of its proper divisors (92085827).

280870645 is a wasteful number, since it uses less digits than its factorization.

280870645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141 (or 3130 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 280870645 is about 16759.1958339295. The cubic root of 280870645 is about 654.8906407948.

The spelling of 280870645 in words is "two hundred eighty million, eight hundred seventy thousand, six hundred forty-five".