280788 has 12 divisors (see below), whose sum is σ = 655200. Its totient is φ = 93592.

The previous prime is 280771. The next prime is 280811. The reversal of 280788 is 887082.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280788.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 11688 + ... + 11711.

It is an arithmetic number, because the mean of its divisors is an integer number (54600).

2²⁸⁰⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

280788 is an abundant number, since it is smaller than the sum of its proper divisors (374412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280788 is a wasteful number, since it uses less digits than its factorization.

280788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23406 (or 23404 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 280788 is about 529.8943290884. The cubic root of 280788 is about 65.4826401559.

The spelling of 280788 in words is "two hundred eighty thousand, seven hundred eighty-eight".