280769 has 2 divisors, whose sum is σ = 280770. Its totient is φ = 280768.

The previous prime is 280759. The next prime is 280771. The reversal of 280769 is 967082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211600 + 69169 = 460^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 280769 - 2⁸ = 280513 is a prime.

It is a super-2 number, since 2×280769² = 157662462722, which contains 22 as substring.

Together with 280771, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280769.

It is not a weakly prime, because it can be changed into another prime (280729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140384 + 140385.

It is an arithmetic number, because the mean of its divisors is an integer number (140385).

2²⁸⁰⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

280769 is a deficient number, since it is larger than the sum of its proper divisors (1).

280769 is an equidigital number, since it uses as much as digits as its factorization.

280769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 280769 is about 529.8764006823. The cubic root of 280769 is about 65.4811631244.

The spelling of 280769 in words is "two hundred eighty thousand, seven hundred sixty-nine".