280726 has 4 divisors (see below), whose sum is σ = 421092. Its totient is φ = 140362.

The previous prime is 280717. The next prime is 280729. The reversal of 280726 is 627082.

280726 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 280726.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280729) by changing a digit.

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 as a sum of consecutive naturals, namely, 70180 + ... + 70183.

It is an arithmetic number, because the mean of its divisors is an integer number (105273).

2²⁸⁰⁷²⁶ is an apocalyptic number.

280726 is a deficient number, since it is larger than the sum of its proper divisors (140366).

280726 is a wasteful number, since it uses less digits than its factorization.

280726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140365.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 280726 is about 529.8358236284. The cubic root of 280726 is about 65.4778201226.

The spelling of 280726 in words is "two hundred eighty thousand, seven hundred twenty-six".