280733 has 4 divisors (see below), whose sum is σ = 283008. Its totient is φ = 278460.

The previous prime is 280729. The next prime is 280751. The reversal of 280733 is 337082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 337082 = 2 ⋅168541.

It is a cyclic number.

It is not a de Polignac number, because 280733 - 2² = 280729 is a prime.

It is a super-2 number, since 2×280733² = 157622034578, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 280699 and 280708.

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 280733.

It is not an unprimeable number, because it can be changed into a prime (280703) 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, 941 + ... + 1202.

It is an arithmetic number, because the mean of its divisors is an integer number (70752).

2²⁸⁰⁷³³ is an apocalyptic number.

It is an amenable number.

280733 is a deficient number, since it is larger than the sum of its proper divisors (2275).

280733 is a wasteful number, since it uses less digits than its factorization.

280733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 280733 is about 529.8424294071. The cubic root of 280733 is about 65.4783643555.

The spelling of 280733 in words is "two hundred eighty thousand, seven hundred thirty-three".