280064 has 20 divisors (see below), whose sum is σ = 560604. Its totient is φ = 139776.

The previous prime is 280061. The next prime is 280069. The reversal of 280064 is 460082.

280064 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239 + ... + 785.

2²⁸⁰⁰⁶⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280302).

280064 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

280064 is an frugal number, since it uses more digits than its factorization.

280064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 280064 is about 529.2107330733. The cubic root of 280064 is about 65.4263103060.

The spelling of 280064 in words is "two hundred eighty thousand, sixty-four".