280887 has 4 divisors (see below), whose sum is σ = 374520. Its totient is φ = 187256.

The previous prime is 280883. The next prime is 280897. The reversal of 280887 is 788082.

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

It is a cyclic number.

It is not a de Polignac number, because 280887 - 2² = 280883 is a prime.

It is a D-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 280887.

It is not an unprimeable number, because it can be changed into a prime (280883) 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, 46812 + ... + 46817.

It is an arithmetic number, because the mean of its divisors is an integer number (93630).

2²⁸⁰⁸⁸⁷ is an apocalyptic number.

280887 is a deficient number, since it is larger than the sum of its proper divisors (93633).

280887 is an equidigital number, since it uses as much as digits as its factorization.

280887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93632.

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

The square root of 280887 is about 529.9877357072. The cubic root of 280887 is about 65.4903351900.

The spelling of 280887 in words is "two hundred eighty thousand, eight hundred eighty-seven".