280006530 has 32 divisors (see below), whose sum is σ = 678547584. Its totient is φ = 73942656.

The previous prime is 280006511. The next prime is 280006537. The reversal of 280006530 is 35600082.

It is a super-3 number, since 3×280006530³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 280006530.

It is not an unprimeable number, because it can be changed into a prime (280006537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42219 + ... + 48398.

It is an arithmetic number, because the mean of its divisors is an integer number (21204612).

Almost surely, 2^280006530 is an apocalyptic number.

280006530 is an abundant number, since it is smaller than the sum of its proper divisors (398541054).

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

280006530 is a wasteful number, since it uses less digits than its factorization.

280006530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90730.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 280006530 is about 16733.3956506144. The cubic root of 280006530 is about 654.2183477275.

The spelling of 280006530 in words is "two hundred eighty million, six thousand, five hundred thirty".