280724 has 6 divisors (see below), whose sum is σ = 491274. Its totient is φ = 140360.

The previous prime is 280717. The next prime is 280729. The reversal of 280724 is 427082.

280724 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 232324 + 48400 = 482^2 + 220^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 280724.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 35087 + ... + 35094.

It is an arithmetic number, because the mean of its divisors is an integer number (81879).

2²⁸⁰⁷²⁴ is an apocalyptic number.

It is an amenable number.

280724 is a deficient number, since it is larger than the sum of its proper divisors (210550).

280724 is a wasteful number, since it uses less digits than its factorization.

280724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70185 (or 70183 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 280724 is about 529.8339362480. The cubic root of 280724 is about 65.4776646259.

The spelling of 280724 in words is "two hundred eighty thousand, seven hundred twenty-four".