280480213 has 4 divisors (see below), whose sum is σ = 302055628. Its totient is φ = 258904800.

The previous prime is 280480181. The next prime is 280480231. The reversal of 280480213 is 312084082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17489124 + 262991089 = 4182^2 + 16217^2 .

It is a cyclic number.

It is not a de Polignac number, because 280480213 - 2⁵ = 280480181 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 (280480243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10787688 + ... + 10787713.

It is an arithmetic number, because the mean of its divisors is an integer number (75513907).

Almost surely, 2^280480213 is an apocalyptic number.

It is an amenable number.

280480213 is a deficient number, since it is larger than the sum of its proper divisors (21575415).

280480213 is a wasteful number, since it uses less digits than its factorization.

280480213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21575414.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 280480213 is about 16747.5434915094. The cubic root of 280480213 is about 654.5870504704.

The spelling of 280480213 in words is "two hundred eighty million, four hundred eighty thousand, two hundred thirteen".