280208045 has 16 divisors (see below), whose sum is σ = 366191280. Its totient is φ = 204593664.

The previous prime is 280208017. The next prime is 280208053. The reversal of 280208045 is 540802082.

It can be written as a sum of positive squares in 8 ways, for example, as 59923081 + 220284964 = 7741^2 + 14842^2 .

It is a cyclic number.

It is not a de Polignac number, because 280208045 - 2¹⁰ = 280207021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 280207999 and 280208017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18434 + ... + 30003.

It is an arithmetic number, because the mean of its divisors is an integer number (22886955).

Almost surely, 2^280208045 is an apocalyptic number.

It is an amenable number.

280208045 is a deficient number, since it is larger than the sum of its proper divisors (85983235).

280208045 is a wasteful number, since it uses less digits than its factorization.

280208045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48544.

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 280208045 is about 16739.4159097622. The cubic root of 280208045 is about 654.3752526357.

The spelling of 280208045 in words is "two hundred eighty million, two hundred eight thousand, forty-five".