280136 has 24 divisors (see below), whose sum is σ = 560070. Its totient is φ = 131328.

The previous prime is 280129. The next prime is 280139. The reversal of 280136 is 631082.

280136 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 244036 + 36100 = 494^2 + 190^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280139) by changing a digit.

280136 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2840 + ... + 2936.

2²⁸⁰¹³⁶ is an apocalyptic number.

It is an amenable number.

280136 is a deficient number, since it is larger than the sum of its proper divisors (279934).

280136 is a wasteful number, since it uses less digits than its factorization.

280136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 280136 is about 529.2787545330. The cubic root of 280136 is about 65.4319165136.

The spelling of 280136 in words is "two hundred eighty thousand, one hundred thirty-six".