280090 has 16 divisors (see below), whose sum is σ = 518472. Its totient is φ = 108864.

The previous prime is 280069. The next prime is 280097. The reversal of 280090 is 90082.

280090 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 4 ways, for example, as 271441 + 8649 = 521^2 + 93^2 .

It is not an unprimeable number, because it can be changed into a prime (280097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9 + ... + 748.

2²⁸⁰⁰⁹⁰ is an apocalyptic number.

280090 is a deficient number, since it is larger than the sum of its proper divisors (238382).

280090 is a wasteful number, since it uses less digits than its factorization.

280090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 280090 is about 529.2352973867. The cubic root of 280090 is about 65.4283348807.

The spelling of 280090 in words is "two hundred eighty thousand, ninety".