280775 has 12 divisors (see below), whose sum is σ = 380184. Its totient is φ = 204000.

The previous prime is 280771. The next prime is 280811. The reversal of 280775 is 577082.

It is not a de Polignac number, because 280775 - 2² = 280771 is a prime.

It is an Ulam number.

It is a Duffinian number.

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 280775.

It is not an unprimeable number, because it can be changed into a prime (280771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236 + ... + 785.

It is an arithmetic number, because the mean of its divisors is an integer number (31682).

2²⁸⁰⁷⁷⁵ is an apocalyptic number.

280775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

280775 is a deficient number, since it is larger than the sum of its proper divisors (99409).

280775 is a wasteful number, since it uses less digits than its factorization.

280775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042 (or 1037 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 280775 is about 529.8820623497. The cubic root of 280775 is about 65.4816295626.

It can be divided in two parts, 28077 and 5, that added together give a palindrome (28082).

The spelling of 280775 in words is "two hundred eighty thousand, seven hundred seventy-five".