280045089 has 12 divisors (see below), whose sum is σ = 408222100. Its totient is φ = 184983264.

The previous prime is 280045081. The next prime is 280045099. The reversal of 280045089 is 980540082.

It can be written as a sum of positive squares in 2 ways, for example, as 163405089 + 116640000 = 12783^2 + 10800^2 .

It is not a de Polignac number, because 280045089 - 2³ = 280045081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280045081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141754 + ... + 143715.

Almost surely, 2^280045089 is an apocalyptic number.

It is an amenable number.

280045089 is a deficient number, since it is larger than the sum of its proper divisors (128177011).

280045089 is a wasteful number, since it uses less digits than its factorization.

280045089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285584 (or 285581 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 280045089 is about 16734.5477680157. The cubic root of 280045089 is about 654.2483766074.

The spelling of 280045089 in words is "two hundred eighty million, forty-five thousand, eighty-nine".