280830 has 64 divisors (see below), whose sum is σ = 787968. Its totient is φ = 63360.

The previous prime is 280817. The next prime is 280837. The reversal of 280830 is 38082.

280830 = T₄ + T₅ + ... + T₁₁₈.

It is a junction number, because it is equal to n+sod(n) for n = 280797 and 280806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280837) by changing a digit.

280830 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7572 + ... + 7608.

It is an arithmetic number, because the mean of its divisors is an integer number (12312).

2²⁸⁰⁸³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393984).

280830 is an abundant number, since it is smaller than the sum of its proper divisors (507138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280830 is a wasteful number, since it uses less digits than its factorization.

280830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 280830 is about 529.9339581495. The cubic root of 280830 is about 65.4859049367.

The spelling of 280830 in words is "two hundred eighty thousand, eight hundred thirty".