280634 has 4 divisors (see below), whose sum is σ = 420954. Its totient is φ = 140316.

The previous prime is 280627. The next prime is 280639. The reversal of 280634 is 436082.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 156025 + 124609 = 395^2 + 353^2 .

It is not an unprimeable number, because it can be changed into a prime (280639) 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, 70157 + ... + 70160.

2²⁸⁰⁶³⁴ is an apocalyptic number.

280634 is a deficient number, since it is larger than the sum of its proper divisors (140320).

280634 is a wasteful number, since it uses less digits than its factorization.

280634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140319.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 280634 is about 529.7489971675. The cubic root of 280634 is about 65.4706665071.

The spelling of 280634 in words is "two hundred eighty thousand, six hundred thirty-four".